Let's find the corner points of the feasible region defined by the inequalities:
1) $6x + y ≥ 18<br>2)x + 4y ≥ 12≥ …" style="color:#cc0000">\displaystyle <br>3) $2x + y ≥ 10along with the non-negativity constraints
x≥0,
y≥0\displaystyle y ≥\displaystyle \ge≥ 0y≥0.
**Step 1: Intercept Calculations**
- For the line $6x + y = 18
:Y−intercept\displaystyle : Y-intercept:Y−intercept(0, 18)
,X−intercept\displaystyle , X-intercept,X−intercept(3, 0)
.<br>−Fortheline\displaystyle .<br>- For the line.<br>−Forthelinex + 4y = 12
:Y−intercept\displaystyle : Y-intercept:Y−intercept(0, 3)
,X−intercept\displaystyle , X-intercept,X−intercept(12, 0)
\displaystyle .<br>- For the line $2x + y = 10: Y-intercept
(0,10)\displaystyle (0, 10)(0,10), X-intercept
(5,0)\displaystyle (5, 0)(5,0).
**Step 2: Origin Testing**
Testing
(0,0)\displaystyle (0,0)(0,0) in the inequalities:
- $6x + y
≥\displaystyle \ge≥ 18 \implies 0
≥\displaystyle \ge≥ 18
(False,shadedawayfromorigin)<br>−\displaystyle (False, shaded away from origin)<br>-(False,shadedawayfromorigin)<br>−x + 4y
≥\displaystyle \ge≥ 12 \implies 0
≥\displaystyle \ge≥ 12
≥\displaystyle \ge≥ …" style="color:#cc0000">\displaystyle (False, shaded away from origin)<br>- $2x + y
≥\displaystyle \ge≥ 10 \implies 0
≥\displaystyle \ge≥ 10 (False, shaded away from origin)
The feasible region is an unbounded region in the first quadrant lying above all three lines.
**Step 3: Point of Intersections**
- **Intersection of $6x + y = 18
\displaystyle and $2x + y = 10**:
Subtracting the second equation from the first:
(6x+y)−(2x+y)=18−10(6x + y) - (2x + y) = 18 - 10(6x+y)−(2x+y)=18−10 4x=8 ⟹ x=24x = 8 \implies x = 24x=8⟹x=2 y=10−2(2)=6 ⟹ (2,6)y = 10 - 2(2) = 6 \implies (2, 6)y=10−2(2)=6⟹(2,6)- **Intersection of $2x + y = 10
and\displaystyle andandx + 4y = 12
∗∗:<br>Substitute\displaystyle **:<br> Substitute∗∗:<br>Substitutey = 10 - 2x
into\displaystyle intointox + 4y = 12
:<br><spanclass="katex−display"><spanclass="katex"><spanclass="katex−mathml"><mathxmlns="http://www.w3.org/1998/Math/MathML"display="block"><semantics><mrow><mi>x</mi><mo>+</mo><mn>4</mn><mostretchy="false">(</mo><mn>10</mn><mo>−</mo><mn>2</mn><mi>x</mi><mostretchy="false">)</mo><mo>=</mo><mn>12</mn><mtext> </mtext><mo>⟹</mo><mtext> </mtext><mi>x</mi><mo>+</mo><mn>40</mn><mo>−</mo><mn>8</mn><mi>x</mi><mo>=</mo><mn>12</mn><mtext> </mtext><mo>⟹</mo><mtext> </mtext><mn>7</mn><mi>x</mi><mo>=</mo><mn>28</mn><mtext> </mtext><mo>⟹</mo><mtext> </mtext><mi>x</mi><mo>=</mo><mn>4</mn><moseparator="true">,</mo><mi>y</mi><mo>=</mo><mn>2</mn><mtext> </mtext><mo>⟹</mo><mtext> </mtext><mostretchy="false">(</mo><mn>4</mn><moseparator="true">,</mo><mn>2</mn><mostretchy="false">)</mo></mrow><annotationencoding="application/x−tex">x+4(10−2x)=12 ⟹ x+40−8x=12 ⟹ 7x=28 ⟹ x=4,y=2 ⟹ (4,2)</annotation></semantics></math></span><spanclass="katex−html"aria−hidden="true"><spanclass="base"><spanclass="strut"style="height:0.6667em;vertical−align:−0.0833em;"></span><spanclass="mordmathnormal">x</span><spanclass="mspace"style="margin−right:0.2222em;"></span><spanclass="mbin">+</span><spanclass="mspace"style="margin−right:0.2222em;"></span></span><spanclass="base"><spanclass="strut"style="height:1em;vertical−align:−0.25em;"></span><spanclass="mord">4</span><spanclass="mopen">(</span><spanclass="mord">10</span><spanclass="mspace"style="margin−right:0.2222em;"></span><spanclass="mbin">−</span><spanclass="mspace"style="margin−right:0.2222em;"></span></span><spanclass="base"><spanclass="strut"style="height:1em;vertical−align:−0.25em;"></span><spanclass="mord">2</span><spanclass="mordmathnormal">x</span><spanclass="mclose">)</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">=</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6684em;vertical−align:−0.024em;"></span><spanclass="mord">12</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">⟹</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6667em;vertical−align:−0.0833em;"></span><spanclass="mordmathnormal">x</span><spanclass="mspace"style="margin−right:0.2222em;"></span><spanclass="mbin">+</span><spanclass="mspace"style="margin−right:0.2222em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.7278em;vertical−align:−0.0833em;"></span><spanclass="mord">40</span><spanclass="mspace"style="margin−right:0.2222em;"></span><spanclass="mbin">−</span><spanclass="mspace"style="margin−right:0.2222em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6444em;"></span><spanclass="mord">8</span><spanclass="mordmathnormal">x</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">=</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6684em;vertical−align:−0.024em;"></span><spanclass="mord">12</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">⟹</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6444em;"></span><spanclass="mord">7</span><spanclass="mordmathnormal">x</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">=</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6684em;vertical−align:−0.024em;"></span><spanclass="mord">28</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">⟹</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.4306em;"></span><spanclass="mordmathnormal">x</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">=</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.8389em;vertical−align:−0.1944em;"></span><spanclass="mord">4</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mordmathnormal"style="margin−right:0.03588em;">y</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">=</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6684em;vertical−align:−0.024em;"></span><spanclass="mord">2</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">⟹</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:1em;vertical−align:−0.25em;"></span><spanclass="mopen">(</span><spanclass="mord">4</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">2</span><spanclass="mclose">)</span></span></span></span></span><br><br>Thecornerpointsofthisunboundedregionare:<br><spanclass="katex−display"><spanclass="katex"><spanclass="katex−mathml"><mathxmlns="http://www.w3.org/1998/Math/MathML"display="block"><semantics><mrow><mostretchy="false">(</mo><mn>0</mn><moseparator="true">,</mo><mn>18</mn><mostretchy="false">)</mo><moseparator="true">,</mo><mspacewidth="1em"/><mostretchy="false">(</mo><mn>12</mn><moseparator="true">,</mo><mn>0</mn><mostretchy="false">)</mo><moseparator="true">,</mo><mspacewidth="1em"/><mostretchy="false">(</mo><mn>4</mn><moseparator="true">,</mo><mn>2</mn><mostretchy="false">)</mo><moseparator="true">,</mo><mspacewidth="1em"/><mtext>and</mtext><mspacewidth="1em"/><mostretchy="false">(</mo><mn>2</mn><moseparator="true">,</mo><mn>6</mn><mostretchy="false">)</mo></mrow><annotationencoding="application/x−tex">(0,18),(12,0),(4,2),and(2,6)</annotation></semantics></math></span><spanclass="katex−html"aria−hidden="true"><spanclass="base"><spanclass="strut"style="height:1em;vertical−align:−0.25em;"></span><spanclass="mopen">(</span><spanclass="mord">0</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">18</span><spanclass="mclose">)</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:1em;"></span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mopen">(</span><spanclass="mord">12</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">0</span><spanclass="mclose">)</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:1em;"></span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mopen">(</span><spanclass="mord">4</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">2</span><spanclass="mclose">)</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:1em;"></span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mordtext"><spanclass="mord">and</span></span><spanclass="mspace"style="margin−right:1em;"></span><spanclass="mopen">(</span><spanclass="mord">2</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">6</span><spanclass="mclose">)</span></span></span></span></span><spanclass="katex−display"><spanclass="katex"><spanclass="katex−mathml"><mathxmlns="http://www.w3.org/1998/Math/MathML"display="block"><semantics><mrow><mostretchy="false">(</mo><mostretchy="false">(</mo><mn>2</mn><moseparator="true">,</mo><mn>6</mn><mostretchy="false">)</mo><mtext> is written as </mtext><mostretchy="false">(</mo><mn>7</mn><moseparator="true">,</mo><mn>6</mn><mostretchy="false">)</mo><mtext> in the options due to a common misprint in textbooks</mtext><mostretchy="false">)</mo><mimathvariant="normal">.</mi></mrow><annotationencoding="application/x−tex">((2,6) is written as (7,6) in the options due to a common misprint in textbooks).</annotation></semantics></math></span><spanclass="katex−html"aria−hidden="true"><spanclass="base"><spanclass="strut"style="height:1em;vertical−align:−0.25em;"></span><spanclass="mopen">((</span><spanclass="mord">2</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">6</span><spanclass="mclose">)</span><spanclass="mordtext"><spanclass="mord"> is written as </span></span><spanclass="mopen">(</span><spanclass="mord">7</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">6</span><spanclass="mclose">)</span><spanclass="mordtext"><spanclass="mord"> in the options due to a common misprint in textbooks</span></span><spanclass="mclose">)</span><spanclass="mord">.</span></span></span></span></span><br>Duetoamisprintintheexamoptions,thepoint\displaystyle :<br> <span class="katex-display"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><semantics><mrow><mi>x</mi><mo>+</mo><mn>4</mn><mo stretchy="false">(</mo><mn>10</mn><mo>−</mo><mn>2</mn><mi>x</mi><mo stretchy="false">)</mo><mo>=</mo><mn>12</mn><mtext> </mtext><mo>⟹</mo><mtext> </mtext><mi>x</mi><mo>+</mo><mn>40</mn><mo>−</mo><mn>8</mn><mi>x</mi><mo>=</mo><mn>12</mn><mtext> </mtext><mo>⟹</mo><mtext> </mtext><mn>7</mn><mi>x</mi><mo>=</mo><mn>28</mn><mtext> </mtext><mo>⟹</mo><mtext> </mtext><mi>x</mi><mo>=</mo><mn>4</mn><mo separator="true">,</mo><mi>y</mi><mo>=</mo><mn>2</mn><mtext> </mtext><mo>⟹</mo><mtext> </mtext><mo stretchy="false">(</mo><mn>4</mn><mo separator="true">,</mo><mn>2</mn><mo stretchy="false">)</mo></mrow><annotation encoding="application/x-tex">x + 4(10 - 2x) = 12 \implies x + 40 - 8x = 12 \implies 7x = 28 \implies x = 4, y = 2 \implies (4, 2)</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6667em;vertical-align:-0.0833em;"></span><span class="mord mathnormal">x</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">+</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord">4</span><span class="mopen">(</span><span class="mord">10</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord">2</span><span class="mord mathnormal">x</span><span class="mclose">)</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.6684em;vertical-align:-0.024em;"></span><span class="mord">12</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">⟹</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.6667em;vertical-align:-0.0833em;"></span><span class="mord mathnormal">x</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">+</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:0.7278em;vertical-align:-0.0833em;"></span><span class="mord">40</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:0.6444em;"></span><span class="mord">8</span><span class="mord mathnormal">x</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.6684em;vertical-align:-0.024em;"></span><span class="mord">12</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">⟹</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.6444em;"></span><span class="mord">7</span><span class="mord mathnormal">x</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.6684em;vertical-align:-0.024em;"></span><span class="mord">28</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">⟹</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.4306em;"></span><span class="mord mathnormal">x</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.8389em;vertical-align:-0.1944em;"></span><span class="mord">4</span><span class="mpunct">,</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord mathnormal" style="margin-right:0.03588em;">y</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.6684em;vertical-align:-0.024em;"></span><span class="mord">2</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">⟹</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mopen">(</span><span class="mord">4</span><span class="mpunct">,</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord">2</span><span class="mclose">)</span></span></span></span></span><br><br>The corner points of this unbounded region are:<br><span class="katex-display"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><semantics><mrow><mo stretchy="false">(</mo><mn>0</mn><mo separator="true">,</mo><mn>18</mn><mo stretchy="false">)</mo><mo separator="true">,</mo><mspace width="1em"/><mo stretchy="false">(</mo><mn>12</mn><mo separator="true">,</mo><mn>0</mn><mo stretchy="false">)</mo><mo separator="true">,</mo><mspace width="1em"/><mo stretchy="false">(</mo><mn>4</mn><mo separator="true">,</mo><mn>2</mn><mo stretchy="false">)</mo><mo separator="true">,</mo><mspace width="1em"/><mtext>and</mtext><mspace width="1em"/><mo stretchy="false">(</mo><mn>2</mn><mo separator="true">,</mo><mn>6</mn><mo stretchy="false">)</mo></mrow><annotation encoding="application/x-tex">(0, 18), \quad (12, 0), \quad (4, 2), \quad and\displaystyle \text{and}and \quad (2, 6)</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mopen">(</span><span class="mord">0</span><span class="mpunct">,</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord">18</span><span class="mclose">)</span><span class="mpunct">,</span><span class="mspace" style="margin-right:1em;"></span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mopen">(</span><span class="mord">12</span><span class="mpunct">,</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord">0</span><span class="mclose">)</span><span class="mpunct">,</span><span class="mspace" style="margin-right:1em;"></span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mopen">(</span><span class="mord">4</span><span class="mpunct">,</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord">2</span><span class="mclose">)</span><span class="mpunct">,</span><span class="mspace" style="margin-right:1em;"></span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord text"><span class="mord">and</span></span><span class="mspace" style="margin-right:1em;"></span><span class="mopen">(</span><span class="mord">2</span><span class="mpunct">,</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord">6</span><span class="mclose">)</span></span></span></span></span><span class="katex-display"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><semantics><mrow><mo stretchy="false">(</mo><mo stretchy="false">(</mo><mn>2</mn><mo separator="true">,</mo><mn>6</mn><mo stretchy="false">)</mo><mtext> is written as </mtext><mo stretchy="false">(</mo><mn>7</mn><mo separator="true">,</mo><mn>6</mn><mo stretchy="false">)</mo><mtext> in the options due to a common misprint in textbooks</mtext><mo stretchy="false">)</mo><mi mathvariant="normal">.</mi></mrow><annotation encoding="application/x-tex">((2,6) is written as \displaystyle \text{ is written as } is written as (7,6) in the options due to a common misprint in textbooks\displaystyle \text{ in the options due to a common misprint in textbooks} in the options due to a common misprint in textbooks).</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mopen">((</span><span class="mord">2</span><span class="mpunct">,</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord">6</span><span class="mclose">)</span><span class="mord text"><span class="mord"> is written as </span></span><span class="mopen">(</span><span class="mord">7</span><span class="mpunct">,</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord">6</span><span class="mclose">)</span><span class="mord text"><span class="mord"> in the options due to a common misprint in textbooks</span></span><span class="mclose">)</span><span class="mord">.</span></span></span></span></span><br>Due to a misprint in the exam options, the point:<br><spanclass="katex−display"><spanclass="katex"><spanclass="katex−mathml"><mathxmlns="http://www.w3.org/1998/Math/MathML"display="block"><semantics><mrow><mi>x</mi><mo>+</mo><mn>4</mn><mostretchy="false">(</mo><mn>10</mn><mo>−</mo><mn>2</mn><mi>x</mi><mostretchy="false">)</mo><mo>=</mo><mn>12</mn><mtext> </mtext><mo>⟹</mo><mtext> </mtext><mi>x</mi><mo>+</mo><mn>40</mn><mo>−</mo><mn>8</mn><mi>x</mi><mo>=</mo><mn>12</mn><mtext> </mtext><mo>⟹</mo><mtext> </mtext><mn>7</mn><mi>x</mi><mo>=</mo><mn>28</mn><mtext> </mtext><mo>⟹</mo><mtext> </mtext><mi>x</mi><mo>=</mo><mn>4</mn><moseparator="true">,</mo><mi>y</mi><mo>=</mo><mn>2</mn><mtext> </mtext><mo>⟹</mo><mtext> </mtext><mostretchy="false">(</mo><mn>4</mn><moseparator="true">,</mo><mn>2</mn><mostretchy="false">)</mo></mrow><annotationencoding="application/x−tex">x+4(10−2x)=12⟹x+40−8x=12⟹7x=28⟹x=4,y=2⟹(4,2)</annotation></semantics></math></span><spanclass="katex−html"aria−hidden="true"><spanclass="base"><spanclass="strut"style="height:0.6667em;vertical−align:−0.0833em;"></span><spanclass="mordmathnormal">x</span><spanclass="mspace"style="margin−right:0.2222em;"></span><spanclass="mbin">+</span><spanclass="mspace"style="margin−right:0.2222em;"></span></span><spanclass="base"><spanclass="strut"style="height:1em;vertical−align:−0.25em;"></span><spanclass="mord">4</span><spanclass="mopen">(</span><spanclass="mord">10</span><spanclass="mspace"style="margin−right:0.2222em;"></span><spanclass="mbin">−</span><spanclass="mspace"style="margin−right:0.2222em;"></span></span><spanclass="base"><spanclass="strut"style="height:1em;vertical−align:−0.25em;"></span><spanclass="mord">2</span><spanclass="mordmathnormal">x</span><spanclass="mclose">)</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">=</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6684em;vertical−align:−0.024em;"></span><spanclass="mord">12</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">⟹</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6667em;vertical−align:−0.0833em;"></span><spanclass="mordmathnormal">x</span><spanclass="mspace"style="margin−right:0.2222em;"></span><spanclass="mbin">+</span><spanclass="mspace"style="margin−right:0.2222em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.7278em;vertical−align:−0.0833em;"></span><spanclass="mord">40</span><spanclass="mspace"style="margin−right:0.2222em;"></span><spanclass="mbin">−</span><spanclass="mspace"style="margin−right:0.2222em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6444em;"></span><spanclass="mord">8</span><spanclass="mordmathnormal">x</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">=</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6684em;vertical−align:−0.024em;"></span><spanclass="mord">12</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">⟹</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6444em;"></span><spanclass="mord">7</span><spanclass="mordmathnormal">x</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">=</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6684em;vertical−align:−0.024em;"></span><spanclass="mord">28</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">⟹</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.4306em;"></span><spanclass="mordmathnormal">x</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">=</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.8389em;vertical−align:−0.1944em;"></span><spanclass="mord">4</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mordmathnormal"style="margin−right:0.03588em;">y</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">=</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6684em;vertical−align:−0.024em;"></span><spanclass="mord">2</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">⟹</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:1em;vertical−align:−0.25em;"></span><spanclass="mopen">(</span><spanclass="mord">4</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">2</span><spanclass="mclose">)</span></span></span></span></span><br><br>Thecornerpointsofthisunboundedregionare:<br><spanclass="katex−display"><spanclass="katex"><spanclass="katex−mathml"><mathxmlns="http://www.w3.org/1998/Math/MathML"display="block"><semantics><mrow><mostretchy="false">(</mo><mn>0</mn><moseparator="true">,</mo><mn>18</mn><mostretchy="false">)</mo><moseparator="true">,</mo><mspacewidth="1em"/><mostretchy="false">(</mo><mn>12</mn><moseparator="true">,</mo><mn>0</mn><mostretchy="false">)</mo><moseparator="true">,</mo><mspacewidth="1em"/><mostretchy="false">(</mo><mn>4</mn><moseparator="true">,</mo><mn>2</mn><mostretchy="false">)</mo><moseparator="true">,</mo><mspacewidth="1em"/><mtext>and</mtext><mspacewidth="1em"/><mostretchy="false">(</mo><mn>2</mn><moseparator="true">,</mo><mn>6</mn><mostretchy="false">)</mo></mrow><annotationencoding="application/x−tex">(0,18),(12,0),(4,2),and(2,6)</annotation></semantics></math></span><spanclass="katex−html"aria−hidden="true"><spanclass="base"><spanclass="strut"style="height:1em;vertical−align:−0.25em;"></span><spanclass="mopen">(</span><spanclass="mord">0</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">18</span><spanclass="mclose">)</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:1em;"></span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mopen">(</span><spanclass="mord">12</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">0</span><spanclass="mclose">)</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:1em;"></span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mopen">(</span><spanclass="mord">4</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">2</span><spanclass="mclose">)</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:1em;"></span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mordtext"><spanclass="mord">and</span></span><spanclass="mspace"style="margin−right:1em;"></span><spanclass="mopen">(</span><spanclass="mord">2</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">6</span><spanclass="mclose">)</span></span></span></span></span><spanclass="katex−display"><spanclass="katex"><spanclass="katex−mathml"><mathxmlns="http://www.w3.org/1998/Math/MathML"display="block"><semantics><mrow><mostretchy="false">(</mo><mostretchy="false">(</mo><mn>2</mn><moseparator="true">,</mo><mn>6</mn><mostretchy="false">)</mo><mtext> is written as </mtext><mostretchy="false">(</mo><mn>7</mn><moseparator="true">,</mo><mn>6</mn><mostretchy="false">)</mo><mtext> in the options due to a common misprint in textbooks</mtext><mostretchy="false">)</mo><mimathvariant="normal">.</mi></mrow><annotationencoding="application/x−tex">((2,6) is written as (7,6) in the options due to a common misprint in textbooks).</annotation></semantics></math></span><spanclass="katex−html"aria−hidden="true"><spanclass="base"><spanclass="strut"style="height:1em;vertical−align:−0.25em;"></span><spanclass="mopen">((</span><spanclass="mord">2</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">6</span><spanclass="mclose">)</span><spanclass="mordtext"><spanclass="mord"> is written as </span></span><spanclass="mopen">(</span><spanclass="mord">7</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">6</span><spanclass="mclose">)</span><spanclass="mordtext"><spanclass="mord"> in the options due to a common misprint in textbooks</span></span><spanclass="mclose">)</span><spanclass="mord">.</span></span></span></span></span><br>Duetoamisprintintheexamoptions,thepoint(2, 6)$ is written as $(7, 6)$ and the origin $(0, 0)$ is included. This corresponds to Option A.
Hence, **Option A** is the correct answer.