Linear Equations in Two Variables Formula Class 9 PDF Free Download

Are you looking for important formulas of Linear Equations in Two Variables for Class 9? You’re in the right place! In this post, we’ve compiled all essential formulas from Chapter 4 of Class 9 Maths – Linear Equations in Two Variables. You can download the free PDF and revise quickly for your exams.

1. Linear equations in two variables.

Equation ax + by + c = 0 is a linear equation in two variable x and y.

where a , b , c are real numbers ( a ≠ 0 and b ≠ 0 )

If x = α and y = β is solution of ax + by + c = 0 then aα + bβ + c = 0

(i). The equation ax + by + c = 0 has infinitely many solution.

(ii). The graph of the equation ax + by + c = 0 is a straight line.

(iii). The equation of x – axis is y = 0.

(iv). The equation of y – axis is x = 0.

(v). The equation of straight line which ll to x – axis is y = b.

(vi). The equation of straight line which ll to y – axis is x = a.

(vii). The equation of straight line which ⊥ on x – axis is x = a.

(viii). The equation of straight line which ⊥ on y – axis is y = b.