Question

-x+4y=9
2x-4y=-6
resolvam , obrigada

Answer 1

-x+4y=9 ⇒x=4y-92x-4y=-6

Substituindo:
2(4y-9-4y=-6
8y-18-4y=-6
4y=-6+18
4y=12
y=3

Logo x = 4x3-9
         x=12-9
         x=3