tentukan himpunan penyelesaian sistem persamaan berikut tolong bgt kk

1) 5u - 2v + 1 = 0
5u - 2v = - 1 ... pers 1
u = 2v + 3
u - 2v = 3 ... pers 2
pers 1 & 2
5u - 2v = - 1
u - 2v = 3
------------------(-)
4u = - 4
u = - 1
subtitusi
u - 2v = - 1
- 1 - 2v = - 1
- 2v = - 1 + 1
- 2v = 0
v = 0
hp = ( - 1 , 0)

2) 2x + y = 0 |×5
7x + 5y = 1
maka
10x + 5y = 0
7x + 5y = 1
------------------(-)
3x = - 1
x = - ⅓
subtitusi
2x + y = 0
2(-⅓) + y = 0
- ⅔ + y = 0
y = ⅔
hp = ( - ⅓ , ⅔ )