diket. fungsi f(x) = ax + b. jika f(4) = -2 dan f(-4) = 6, nilai f(8) adalah? mohon bantuannya plus cara yak

F(x) = ax+b
F(4)=-2
>> F(4)=a(4)+b
-2=4a+b .... Pers 1
F(-4)=6
>> F(-4)=a(-4)+b
6=-4a+b... Pers 2
Pers 1 dan 2, eliminasi b
4a+b= -2
-4a+b=6
________-
8a= -8
a= -1
Subtitusi a=-1 ke pers (1)
4a+b= -2
4(-1)+b= -2
-4+b= -2
b = -2+4
b = 2