di ketahui sistem persamaan lienar dua variabel 3x +5y = -25 dan 2x - 7y =4 himpunan penyelesaian nya

eliminasi x
3x + 5y = -25 |×2
2x - 7y = 4 |×3
6x + 10y = -50
6x - 21y = 12
___________-
31y = -62
y = -62 : 31
y = -2
substitusi nilai y = -2 ke 2x - 7y = 4
2x - 7(-2) =4
2x + 14 = 4
2x = 4 -14
2x = -10
x = -5

HP (-5, -2)