Question

fungsi f di definisikan dengan rumus f(x)=ax+b .jika f(4)=3 dan f(-2)=-9 ,maka nilai f(12) adalah??,,||tolong bantuannya

Answer 1

F (x) = ax + b
f(4) = 4a + b
4a + b = 3

f(-2) = -2a + b
-2a + b = -9

4a + b = 3
-2a + b = -9_-
6a = 12
a = 12 / 6
a = 2

4a + b = 3
4(2) + b = 3
8 + b = 3
b = 3 - 8
b = -5

f(x) = 2x - 5
f(12) = 2(12) - 5
= 24 - 5
= 19