RS Aggarwal Chapter 4 Class 9 Maths Exercise 4.2 Solutions: In this chapter, the knowledge of linear equations in one variable shall be recalled and extended to that of two variables. 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. Know more at the parent blog.
Download RS Aggarwal Chapter 4 Class 9 Maths Exercise 4.2 Solutions
Important Definition for RS Aggarwal Chapter 4 Class 9 Maths Ex 4b Solutions
Linear equation in one variable
When an equation has only one variable of degree one, then that equation is known as a linear equation in one variable.
Linear equation in 2 variables
When an equation has two variables both of degree one, then that equation is known as a linear equation in two variables.
The solution of linear equation in 2 variables
A linear equation in two variables has a pair of numbers that can satisfy the equation. This pair of numbers is called the solution of the linear equation in two variables.
Graphical representation of a linear equation in 2 variables
- Any linear equation in the standard form ax+by+c=0 has a pair of solutions in the form (x,y), that can be represented in the coordinate plane.
- When an equation is represented graphically, it is a straight line that may or may not cut the coordinate axes.
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