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f(2) = 5
a(1) + b = 3
a(2) + b = 5
a + b = 3
2a + b = 5
( dieliminasi )
-a = -2
a = 2
b = 1
jadi rumus f(x) = 2(x) + 1
f(1)= a+b = 3 ..... 1 di ubah a= 3-b
f(2) = 2a+b= 5 .....2
2(3-b) +b= 5
6-2b+b= 5
6-b=5
-b=5-6
b= 1 subs ke a= 3-b
a= 3-1
a=2
maka rumus fungsi f(x) = 2x +1