Question

A solução do sistema -6x -3y= -30 e x+3y=15

Answer 1

$-6x-3y=-30 \\ \frac{-6x}{-3}- \frac{3y}{-3}= \frac{-30}{-3} \\ 2x- \frac{3y}{-3}= \frac{-30}{-3} \\ 2x+y= \frac{-30}{-3} \\ 2x+y=10$