Respuesta :
x - y = -3
2x + y = 0
----------------add
3x = -3
x = -3/3
x = -1
x - y = -3
-1 - y = -3
-y = -3 + 1
-y = -2
y = 2
solution is (-1,2)
2x + y = 0
----------------add
3x = -3
x = -3/3
x = -1
x - y = -3
-1 - y = -3
-y = -3 + 1
-y = -2
y = 2
solution is (-1,2)