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2x +y = 3 (+)
x²+2x = 8
x²+2x-8 = 0
(x+4)(x-2) = 0
x = -4 atau x = 2
saat x= -4; maka y= 11 → (-4, 11)
saat x= 2; maka y = -1 → (2, -1)