Linear InequalitiesMCQPYQ June 24Question 1133 of 146
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Given the constraints, x3,y4\displaystyle x \le 3, y \le 4 and 4x+3y12\displaystyle 4x + 3y \le 12, the point ______ is in the feasible region. (Select from the below given list)

Options

A(3,4)\displaystyle (3, 4)
B(2,4)\displaystyle (2, 4)
C(2,2)\displaystyle (2, 2)
D(1,1)\displaystyle (1, 1)
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Correct Answer

Option d(1,1)\displaystyle (1, 1)

All Options:

  • A(3,4)\displaystyle (3, 4)
  • B(2,4)\displaystyle (2, 4)
  • C(2,2)\displaystyle (2, 2)
  • D(1,1)\displaystyle (1, 1)

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Detailed Solution & Explanation

We are given the following constraints:
1) x3\displaystyle x \le 3
2) y4\displaystyle y \le 4
3) 4x+3y12\displaystyle 4x + 3y \le 12

Let's test each of the given points to see which one lies in the feasible region:
- **For Point A (3,4)\displaystyle (3, 4)**:
- x=33\displaystyle x = 3 \le 3 (True)
- y=44\displaystyle y = 4 \le 4 (True)
- 4(3)+3(4)=12+12=2412\displaystyle 4(3) + 3(4) = 12 + 12 = 24 \le 12 (False)
- **For Point B (2,4)\displaystyle (2, 4)**:
- x=23\displaystyle x = 2 \le 3 (True)
- y=44\displaystyle y = 4 \le 4 (True)
- 4(2)+3(4)=8+12=2012\displaystyle 4(2) + 3(4) = 8 + 12 = 20 \le 12 (False)
- **For Point C (2,2)\displaystyle (2, 2)**:
- x=23\displaystyle x = 2 \le 3 (True)
- y=24\displaystyle y = 2 \le 4 (True)
- 4(2)+3(2)=8+6=1412\displaystyle 4(2) + 3(2) = 8 + 6 = 14 \le 12 (False)
- **For Point D (1,1)\displaystyle (1, 1)**:
- x=13\displaystyle x = 1 \le 3 (True)
- y=14\displaystyle y = 1 \le 4 (True)
- 4(1)+3(1)=4+3=712\displaystyle 4(1) + 3(1) = 4 + 3 = 7 \le 12 (True)

Only the point (1,1)\displaystyle (1, 1) satisfies all three constraints and lies in the feasible region.

Hence, **Option D** 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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