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f(-2)=-11
f(2)=5
dit: f(x)=...?
f(-2)=a(-2)+b=-11
(f-2)=-2a+b=-11 .....(pers1)
f(2)=2a+b=5....(pers2)
eliminasi:
-2a+b=-11
2a+b=5
-------------- +
2b= -6
b= -3
sub:
2a+(-3)=5
a=8/2=4
maka f(x)=4x-3