Question

2x+y=5 x-4y=-2 sistemas

Answer 1

{2x+y=5.(4){x-4y=-2{8x+4y=20
{x-4y=-2 (corta 4y cm -4y)
9x=18
x=18/9
x=2

escolha: x-4y=-2
2-4y=-2
-4y=-4.(-1)
4y=4
y=4/4
y= 1