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 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 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 as 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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