Linear InequalitiesMCQMTP June 24 Series IIQuestion 1169 of 146
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Graph of the following linear inequalities : x+y1,y5,x6,7x+9y63,x0,y0\displaystyle x+y \ge 1, y \le 5, x \le 6, 7x+9y \le 63, x \ge 0, y \ge 0 is given below:Mark the common region.

Options

ADCHAD
BBCGB
CABCDEFA
DEDKE
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Correct Answer

Option cABCDEFA

All Options:

  • ADCHAD
  • BBCGB
  • CABCDEFA
  • DEDKE

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Detailed Solution & Explanation

Let's mathematically analyze the region represented by the given linear inequalities:
1) x+y1\displaystyle x + y \ge 1
2) y5\displaystyle y \le 5
3) x6\displaystyle x \le 6
4) 7x+9y63\displaystyle 7x + 9y \le 63
5) x0,y0\displaystyle x \ge 0, y \ge 0

**Step 1: Intercept Calculations**
- For line 1 (x+y=1\displaystyle x + y = 1): intercepts are (1,0)\displaystyle (1,0) and (0,1)\displaystyle (0,1).
- For line 4 (7x+9y=63\displaystyle 7x + 9y = 63): intercepts are (9,0)\displaystyle (9,0) and (0,7)\displaystyle (0,7).

**Step 2: Origin Testing**
- For x+y1\displaystyle x + y \ge 1: Substitute (0,0)\displaystyle (0,0) gives 01\displaystyle 0 \ge 1 (False, shaded away from origin). This line cuts off a small triangular region near (0,0)\displaystyle (0,0).
- For 7x+9y63\displaystyle 7x + 9y \le 63: Substitute (0,0)\displaystyle (0,0) gives 063\displaystyle 0 \le 63 (True, shaded towards origin).
- Line 2 (y5\displaystyle y \le 5) is a horizontal boundary line at height 5\displaystyle 5.
- Line 3 (x6\displaystyle x \le 6) is a vertical boundary line at width 6\displaystyle 6.

**Step 3: Feasible Region Shape**
The intersection of these half-planes in the first quadrant (x0,y0\displaystyle x \ge 0, y \ge 0) forms a bounded polygon with six vertices. The boundaries are truncated on the bottom-left by x+y=1\displaystyle x+y=1, the top by y=5\displaystyle y=5, the right by x=6\displaystyle x=6, and the upper-right by the diagonal 7x+9y=63\displaystyle 7x+9y=63. This six-sided polygon's boundary path is represented by the vertices ABCDEFA\displaystyle ABCDEFA.

Hence, **Option C** is the correct answer.

About This Chapter: Linear Inequalities

Paper

Paper 3: Quantitative Aptitude

Weightage

1-3 Marks

Key Topics

Linear Inequalities in one & two variables

This chapter covers Linear Inequalities in one & two variables and is part of Paper 3: Quantitative Aptitude in the CA Foundation exam.

View Official ICAI Syllabus

Exam Strategy Tip

This topic carries 1-3 Marks weightage. Focus on understanding core concepts rather than memorizing.

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