Diketahui fungsi f(x)=a×+b.jika f(2)=-2dan f(3)=13,tentukan nilai f(4)

Fungsi.

f(x) = ax + b
-2 = a(-2) + b → -2a + b = -2

f(x) = ax + b
13 = a(3) + b → 3a + b = 13

-2a + b = -2
3a + b = 13
----------------- -
-5a = -15 → a = 3
3(3) + b = 13 → b = 4

f(x) = ax + b
f(4) = 3(4) + 4 = 16