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3x + 2y = -4 x3
8X - 6y = 46
9X + 6y = -12 +
17X = 34
X = 2
3X + 2y = -4
3.2 + 2y = -4
2y = -10
y = -5
x - 2y =
2 -2.(-5) =
2 + 10 = 12
3x+2y=-4 >>> dikali 3
JADI
8x-6y=46
9x+6y=-12
___________ +
17x=34
x=2
Kalau x = 2
artinya
3(2)+2y=-4
2y=-4-6
y=-5
SO
x-2y =
2-2(-5)
2+10=12