Respuesta :
4x - 3y = 12
-7x + 3y = -3
------------------
-3x + 0 = 9
x = -3
4(-3) - 3y = 12
-12 - 3y = 12
-3y = 12 + 12
-3y = 24
y = -8
-7x + 3y = -3
------------------
-3x + 0 = 9
x = -3
4(-3) - 3y = 12
-12 - 3y = 12
-3y = 12 + 12
-3y = 24
y = -8