Suatu fungsi f dirumuskan dgn f(x)=ax+b,jika f(5) = 30 dan f(-1)=6,nilai a dan b berturut turut adalahh..

Kelas 8 Matematika
Bab Fungsi 

f(x) = ax + b

f(5) = 5a + b = 30
f(-1) = -a + b = 6

5a + b = 30
-a + b = 6
---------------- -
6a = 24
a = 4

- a + b = 6
-4 + b = 6
b = 6 + 5
b = 10

Maka, a = 4 dan b = 10