diketahui fungsi f(x) = ax + b . jika f(2) = -2 dan f(3) = 13 . tentukan nilai f(4)

f(x)= ax+b
•f(2)= -2
a(-2)+b= -2
-2a +b = -2
b= 2a-2
•f(3)= 13
a(3)+b = 13
3a+(2a-2)= 13
3a+2a-2= 13
5a= 13+2
5a=15
a= 15/5
a= 3
-> b= 2a-2
b= 2(3)-2
b= 6-2
b= 4
-> f(x)= ax+b
f(x)= 3x+4
maka f(4):
f(4)= 3(4)+4
f(4)= 12+4
f(4)= 16