perhatikan grafik fungsi g(x) berikut

Kelas 10 Matematika
Bab Fungsi Komposisi

(2, 0) dan (0, 4)

(y - y1)/(y2 - y1) = (x - x1)/(x2 - x1)
(y - 0)/(4 - 0) = (x - 2)/(0 - 2)
y/4 = (x - 2)/(-2)
y = 4 (x - 2)/(-2)
y = -2x + 4
-2x = y - 4
x = (y - 4)/(-2)
x = (-y + 4)/2
g⁻¹ (x) = (-x + 4)/2