Question

qual e a resoluçao de x-y=2 2x+y=4

Answer 1

$x = 2+y \\ \\ 2(2+y)+y = 4 \\ 4+2y+y=4 \\ 3y=0 \\ y=0/3 \\ y = 0 \\ \\ x = 2+y \\ x=2+0 \\ x=2$