tentukan HP dari 2x+3y=7 dan 7x-y=13

2x + 3y = 7
7x - y = 13 |×3

2x + 3y = 7
21x - 3y = 39
--------------------(+)
23x = 46
x = 2

2x + 3y = 7
2(2) + 3y = 7
4 + 3y = 7
3y = 7 - 4
3y = 3
y = 1

hp = {2,1}