Tolong kak jawab yang C

2x – 3y = 9 ×3
3x + 5y = 4 ×2

6x – 9y = 27
6x + 10y = 8
___________-
-19y = 19
y = -1

substitusi y ke persamaan

2x – 3y = 9
2x – 3×(-1) = 9
2x + 3 = 9
2x = 9 -3
2x = 6
x = 3