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y = 4x -2
terus y dimasukkan ke persamaan kuadratnya
x^2 + 6x - (4x - 2) + 5 = 0
x^2 + 2x + 3 = 0
(x + 1)(x + 2) = 0
x = -1 V x = -2
b. masukkan y ke persamaan kuadratnya
2x - 14 = x^2 - 4x -5
x^2 - 6x + 9 = 0
(x - 3)^2 = 0
x = 3