sederhanakan F(X) = ax+b, F(1)=3, F(3)= 11

F(x) = ax + b
F(1) = a (1) + b = 3
F(3) = a(3) + b = 11
Di eliminasi sehingga dpat
-2a = -8
a = 4
Lalu subtitusi ke persamaan
F(1) = a + b = 3
= 4 + b = 3
= b = -1


Jadi f(x) = 4x - 1