fungsi f dinyatakan fldengan rumus f(x)=ax+b.Jika f(4)=11 dan f(2)=1,maka f(-2) =

f(x) = ax + b
f (4) = 11' ==» 4a + b = 11
f (2) = 1. ==» 2a + b = 1
' --------------- -
2a. = 10.
a = 10/2 = 5
2a + b = 1
2.5 + b = 1
10 + b = 1
b = 1 - 10 = -9
Jadi f (x) = 5x - 9
f (-2) = 5.-2 - 9
= -10 - 9
= -19