Respuesta :
-3x + 9y = -57 x = 4
-3*4 + 9y = -57
-12 + 9y = -57
9y = -57 + 12
9y = 12 - 57
9y =-45 Divide through by 9.
y = -45/9
y = -5
Hope this helped.
-3*4 + 9y = -57
-12 + 9y = -57
9y = -57 + 12
9y = 12 - 57
9y =-45 Divide through by 9.
y = -45/9
y = -5
Hope this helped.