Suatu fungsi dirumuskan f(x)=ax+b, f(2)=18 dan f(3)=4. Nilai a dan b adalah?

Bab Fungsi
Matematika SMP Kelas VIII

f(x) = ax + b

f(2) = 2a + b = 18
f(3) = 3a + b = 4
......-------------------- -
-a = 14
a = -14

3a + b = 4
(3 . (-14)) + b = 4
b = 4 + 42
b = 46

jadi, a = -14 dan b = 46