Question

2x-2y=12
x-2y=11
como se resolve?

Answer 1

2x-2y=12
x-2y=11
x=11+2y

2(11+2y) - 2y=12
22+4y-2y=12
22+2y=12
2y=12-22
2y=-10
y=-5

x-2y=11
x-2*(-5)=11
x+10=11
x=1