Hasil HP dari y=x+7 y=x²+4x-12

y=x+6
y=x²+4x-12 ( - )

y = y
x + 6 = x^2 + 4x - 12
0 = x^2 + 4x - 12 - x - 6
x^2 + 3x -18 = 0
(x + 6)(x - 3) = 0
x = -6 atau
x = 3

y = x + 6
y = 3 + 6
y = 9

Hp = (3,9)