Fungsi h dinyatakan dengan h(x) =px+q. Jika h(5)=-42 dan h(-2)=7,h(12)=

h(x) = px + q
h(5) = -42
h(-2) = 7

f(5) = 5p + q = -42
f(-2) = -2p + q = 7
eliminasi
5p + q = -42
-2p + q = 7
________-
7p = -49
p = -7
substitusi nilai p = -7 ke 5p + q = -42
5(-7) + q = -42
-35 + q = -42
q = -42 +35
q = - 7
fungsi f(x) = -7x -7

f(12) = -7(12) - 7
= - 84 - 7
= - 91