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f(3)=1 --> 3a+b=1
f(1)= -1 --> a+b= -1 dikurang
2a=2
a=1
a+b= -1 --> 1+b= -1 --> b= -2
b. f(x)=ax+b
f(x)= x-2
c. f(-2)=x-2
=-2-2
= -4
3.--5
4.---6
5.----7 n