Question

Suatu fungsi f(x)=ax+b diketahui f(5)= -7 dan f(-1)=5 , maka nilai f(2) adalah

Answer 1

F (5)= 5a+b = -7
f (-1) = -a +b =5
_________________ -
6a = -12
a = -2

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

f (2) = 2a +b = -4 + 3 = -1

Answer 2

F(5)=-7 dan f(-1)=5
5a+b= -7
-a+b= 5  -
6a= -12
a= -2
b= 3

maka f(2)= ax + b
              = -2 (2) + 3
              = -4 + 3
              = -1