fungsi f (x)= ax +b. jika f (1)= -2 dan f (3) =4 maka nilai f (-2) adalah

Mapel : Matematika
Bab : Fungsi

f(x) = ax + b
f(1) = a + b = -2
f(3) = 3a + b = 4
-----------------------   -
              -2a = -6
                  a = -6/-2
                  a = 3

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

 f(x) = ax + b
f(-2) = 3(-2) + (-5)
f(-2) = -6 + (-5)
f(-2) = -11