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f(5)=5a+b=16
f(2)=2a+b=7
----------------------- -
3a=9
a=9/3
a=3
subtitusikan nilai a untuk dpt b
2a+b=7
2(3)+b=7
b=7-6
b=1
subtitusikan nilai a dan b untuk rumus fungsi
f(x)=ax+b
f(x)=3x+1 <----- rumus fungsi