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14=8-2b
6=-2b
b=-3
2. f(1)=a+b= -1...(1)
f(3)=3a+b= 3...(2)
eliminasi
-2a=-4
a=2
subs ke pers 1
a+b=1
2+b=1
b= -1
2a+b= 4-1=3