Y=X-1 Y=Xkuadrat-3X+2

x-1 = x^2 - 3x +2
x^2 -4x +3 = 0
(x-3)(x-1) = 0
x = 3 atau x = 1
jika x=1 maka y = 0
jika x = 3 maka y = 2

y₁=y₂
x - 1 = x² - 3x + 2
0 = x² - 3x - x +2 +1
0= x² -4x +3
0= (x - 3)(x - 1)
x₁=3 ∨ x₂ = 1