X-3y=5 dan 3x+2y=-7 Tentukan himpunan penyelesaian spldv

x - 3y = 5 | dikali 3
3x + 2y = -7 | dikali 1

3x-9y=15
3x+2y=-7
_________ -
7y = 8
y = 8/7 = 1 1/7

3x + 16/7 = -7
3x = -7 - 16/7
3x = -49/7 -16/7
3x = -65/7
3.-7 = x . (-65)
-21/-65 = x
x = 21/65

maaf kalau salah