Question

Diketahui f(x)=ax + b
jika f(-2)= -8
f(5) = 13
maka rumus fungsinya adalah

Answer 1

F(-2) = -2a + b = -8
f(5)  =   5a + b = 13 -
           - 7a = -21
               a = 3.

-2a + b = -8
-6 + b = -8
b = -2.

RUmus fungsi :
f(x) = 3x - 2.