Question

Resolva os sistemas

A){-2x-6y=6
x+7y=-3

B){5x-y=1
2x-3y=-10

C){x+8y=-14
2X-9y=-3

Answer 1

C=2x-9y=-3 x+8y=-14
2(-14-8y)-9y=-3 x=-14-8y
-28-16y-9y=-3 x=-14-8.-0,2
-16y-9y=-3+28 x=-14+1,6
-25y=5 x=-12,4
y=5/-25
y=-0,2