Jika f (x) =a+b f (-1) =3 f (5) =15 Maka f (10) adalah

Mapel : Matematika
Bab : Fungsi

f(-1) = -a + b = 3
f(5) = 5a + b = 15
_____________ _
-6a = -12
a = 2

-a + b = 3
-2 + b = 3
b = 3 + 2
b = 5

rumus fungsi =

2x + 5

f(10) = 2(10) + 5
f(10) = 20 + 5 = 25