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-2x+8y= -16
dijumlahkan
2x+7y=-12
semoga membantu
y-4 per -2-4=x--1 per 8-(-1)
y-4 per -6 =x-1 per 9
-6x+6=9y-36
-6x-9y+6+36=0
-6x-9y+42=0