5x-y=3 dan 10x-5y= 3

5x - y = 3 { ×2 }
10x - 5y = 3 { ×1 }

10x - 2y = 6
10x - 5y = 3
___________ -
-3y = 3
-y = 3/3
y = -1

5x - y = 3
-5 -y = 3
-y = 3+5
-y = 8
y = -8