Linear InequalitiesMCQPYQ June 19Question 1122 of 146
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The common region represented by the following in equalities L1:x+y4;L2:2x+y2\displaystyle L_1: x + y \le 4; L_2: 2x + y \ge 2 is

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Options

AABC\displaystyle \triangle ABC
BABE\displaystyle \triangle ABE
CADE\displaystyle \triangle ADE
DOutside of OAB\displaystyle OAB
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Correct Answer

Option aABC\displaystyle \triangle ABC

All Options:

  • AABC\displaystyle \triangle ABC
  • BABE\displaystyle \triangle ABE
  • CADE\displaystyle \triangle ADE
  • DOutside of OAB\displaystyle OAB

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Detailed Solution & Explanation

We are given two inequalities representing lines L1\displaystyle L_1 and L2\displaystyle L_2:
1) L1:x+y4\displaystyle L_1: x + y \le 4
2) L2:2x+y2\displaystyle L_2: 2x + y \ge 2

**Step 1: Intercept Calculations**
- Line L1:x+y=4\displaystyle L_1: x + y = 4 has Y-intercept (0,4)\displaystyle (0, 4) and X-intercept (4,0)\displaystyle (4, 0).
- Line L2:2x+y=2\displaystyle L_2: 2x + y = 2 has Y-intercept (0,2)\displaystyle (0, 2) and X-intercept (1,0)\displaystyle (1, 0).

**Step 2: Origin Testing**
- For L1\displaystyle L_1: Substitute (0,0)\displaystyle (0,0) into x+y4\displaystyle x + y \le 4:
0+0=04(True)0 + 0 = 0 \le 4 \quad (\text{True})
The region lies below/left of L1\displaystyle L_1, including the origin.
- For L2\displaystyle L_2: Substitute (0,0)\displaystyle (0,0) into 2x+y2\displaystyle 2x + y \ge 2:
2(0)+0=02(False)2(0) + 0 = 0 \ge 2 \quad (\text{False})
The region lies above/right of L2\displaystyle L_2, excluding the origin.

**Step 3: Common Region Geometry**
The common region bounded by these inequalities in the first quadrant forms a triangle. If we label the vertices of this intersection as A\displaystyle A, B\displaystyle B, and C\displaystyle C, the common region is represented by the triangle ABC\displaystyle \triangle ABC.

Hence, **Option A** 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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