himpunan penyelesaian dari sistem persamaan 2x-y-5 = 0 dan x-2y-4=0

2x - y - 5 = 0
2x - y = 5

x - 2y - 4 = 0
x - 2y = 4

2x - y = 5
x - 2y = 4 |×2
2x - y = 5
2x - 4y = 8
------------------(-)
3y = - 3
y = - 1

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

hp = {2,-1}