1.7x+10y=-7 -4x+5y=4 2.2x+7y=-6 x+5y=-9

1) 7x + 10y = -7
-8x + 10y = 8 (stlh di kali 2)
____________-
15x = -15
x = -1
4+5y = 4
5y = 0
y = 5

2) 2x + 7y = -6
2x + 10y = -18
_______________-
-3y = 12
y = -4
2x - 28 = -6
2x = 22
x = 11


maaf kl ada yg salah, smg membantu