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4x + y = 1
Didapatkan persamaan =
(x+1) (x-3) =0
x1 = -1 atau x2 = 3
untuk x1 = -1 maka y = 1-4(-1) = 1+4 = 5
untuk x2 = 3 maka y = 1-4(3) = 1-12 = -11
Jadi HP (-1,5) atau (3,-11)