Question

Solve each of the following systems of equations by the method of cross-multiplication:

3x + 2y + 25 = 0

2x + y + 10 = 0

Answer 1

Method of cross multiplication 

a_1x + b₁y + c₁ = 0

a₂x + b₂y + c₂ = 0

Given,

3x + 2y + 25 = 0

2x + y + 10 = 0

⇒ x = 5 and y = - 20