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F(2)=8
F(2)=a(2)+b=8
2a+b=8
b=8-2a..... (pers. 1)
F(-1)=a(-1)+b=-1
-a+b=-1
-a=-1-b
a=1+b.... (pers. 2)
Masukan pers. 1 ke pers. 2
b=8-2a
b=8-2(1+b)
b=8-2-2b
b=6-2b
b+2b=6
3b=6
b=2
a=1+b=1+2=3
Maka nilai f(5)
F(5)=ax+b
=3×5+2
=15+2
=17