Answer :
-3x + 3y = 12 ⇒ -12x + 4y = 48
4x + 2y = 20 ⇒ 12x + 6y = 60
-2y = -12
-2 -2
y = 6
4x + 2(6) = 20
4x + 12 = 20
-12 -12
4x = 8
4 4
x = 2
(x, y) = (2, 6)
4x + 2y = 20 ⇒ 12x + 6y = 60
-2y = -12
-2 -2
y = 6
4x + 2(6) = 20
4x + 12 = 20
-12 -12
4x = 8
4 4
x = 2
(x, y) = (2, 6)