# NCERT Solutions Class 9 Maths Chapter 4 Linear Equations In Two Variable

## Introduction:

In this chapter we will learn about Linear Equations In Two Variable. you have studied the following points:

1. An equation of the form ax + by + c = 0, where a, b and c are real numbers, such that a and

b are not both zero, is called a linear equation in two variables.

2. A linear equation in two variables has infinitely many solutions.

3. Every point on the graph of a linear equation in two variables is a solution of the linear

equation. Moreover, every solution of the linear equation is a point on the graph of the

linear equation.

4. You will also use the concepts you studied in Chapter 3 to answer these questions.

NCERT Class 9 Maths Chapter 4 Coordinate Geometry :

# NCERT Solutions Class 9 Maths Chapter 4 Linear Equations In Two Variable Exercise 4.1

In this exercise-4.1 we will learn about Linear Equations In Two Variable. Can you write down a linear equations in one variable? We may say that x + 1 = 0, x + √2 = 0 and √2y + √3 = 0 are examples of linear equations in one variable. You also know that such equations have a unique (i.e., one and only one) solution. You may also remember how to represent the solution on a number line. You shall also use the concepts you studied in chapter 3 to answer these questions.

# NCERT Solutions Class 9 Maths Chapter 4 Linear Equations In Two Variable Exercise 4.2

In this exercise-4.2 we will learn about Linear Equations In Two Variable. You have seen that every linear equation in one variable has a unique solution. What can you say about the solution of a linear equation involving two variables? As there are two variables in the equation, a solution means a pair of values, one for x and one for y which satisfy the given equation.