selesaikan spldv berikut 3x-y=-13 x+3y=9

3x-y = -13 (×3)
x+3y = 9 (×1)

9x-3y = -39
x+3y = 9 (dijumlah)
» 10x = -30
» x = -3

3x-y = -13
3(-3)-y = -13
-9-y = -13
y = 13-9
y = 4