Linear InequalitiesMCQPYQ May 18Question 1118 of 146
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The linear relationship between two variables in an inequality:

Options

Aax+byc\displaystyle ax + by \le c
Baxy+byc\displaystyle axy + by \le c
Cax+byc\displaystyle ax + by \le c
Dax+bxyc\displaystyle ax + bxy \le c
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Correct Answer

Option aax+byc\displaystyle ax + by \le c

All Options:

  • Aax+byc\displaystyle ax + by \le c
  • Baxy+byc\displaystyle axy + by \le c
  • Cax+byc\displaystyle ax + by \le c
  • Dax+bxyc\displaystyle ax + bxy \le c

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Detailed Solution & Explanation

A linear inequality in two variables x\displaystyle x and y\displaystyle y is an inequality that can be written in one of the standard forms:
ax+bycax + by \le c
ax+bycax + by \ge c
ax+by<cax + by < c
ax+by>cax + by > c
where a\displaystyle a, b\displaystyle b, and c\displaystyle c are real constants, and a\displaystyle a and b\displaystyle b are not both zero.

The key characteristic of a linear inequality is that the variables x\displaystyle x and y\displaystyle y are of first degree (degree 1) and are not multiplied together (no terms like xy\displaystyle xy, x2\displaystyle x^2, y2\displaystyle y^2, etc.).

Let's analyze the given options:
- **Option A:** ax+byc\displaystyle ax + by \le c contains only x\displaystyle x and y\displaystyle y to the power of 1. It is a linear inequality.
- **Option B:** axy+byc\displaystyle axy + by \le c contains the term xy\displaystyle xy which is of degree 2 (non-linear).
- **Option C:** ax+byc\displaystyle ax + by \le c is identical to Option A (linear).
- **Option D:** ax+bxyc\displaystyle ax + bxy \le c contains the term xy\displaystyle xy which is of degree 2 (non-linear).

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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