Diketahui G(x) = ax + b. Jika G(–2) = –4 dan G(–6) = 12, maka bentuk fungsi G adalah

g(-2) = -4
-2a + b = -4
g(-6) = 12
-6a + b = 12
eliminasi
-2a + b = -4
-6a + b = 12
------------------ _
4a = -16
a = -16/4 = -4
-2(-4) + b = -4
8 + b = -4
b = -4 - 8 = -12

g(x) = -4x - 12