tentuka himpunan penyelesaian sistem persamaan berikut 5x + 2y =23 -x + 7y = -12

5x + 2y = 23
- x + 7y = - 12 |×5
maka
5x + 2y = 23
- 5x + 35y = - 60
-------------------------(+)
37y = - 37
y = - 1

subtitusi
- x + 7y = - 12
- x + 7(-1) = - 12
- x - 7 = - 12
- x = - 12 + 7
- x = - 5
x = 5

hp = ( 5,-1 )