tentukan hp dari 2x-3y=6 dan x-y=1

2x - 3y = 6
x - y = 1 |×2

2x - 3y = 6
2x - 2y = 2
------------------(-)
- y = 4
y = - 4

x - y = 1
x - (-4) = 1
x = 1 - 4
x = - 3

hp = { - 3, - 4}