tentukan himpunan penyelesaian dari SPLDV berikut: {3×+2y =4 2×-y =-9

3x+2y=4 |×1 ----> 3x+2y=4
2x-y = -9 |×2---> 4x-2y = -18
---------------- +
7x = -14 ---> x= -2

x = -2 ----> 2(-2)-y = -9
-4 - y = -9
-y = -9+4
-y = -5
y = 5
HP {-2,5}