Resposta :
2x+y+1=8 2x+2+x=8 x-y=-2
x-y=-2 3x+2=8 2-y=-2
x=2 -y=-2-2
(-1). -y=-4 .(-1)
y=4
x-y=-2 3x+2=8 2-y=-2
x=2 -y=-2-2
(-1). -y=-4 .(-1)
y=4