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f(7)=7a+b=14
f(3)=3a+b=5
----------------------- -
4a=9
a=9/4
subtitusikan nilai a
3a+b=5
3(9/4)+b=5
b=20/4-27/4
b=-7/4
subtitusikan a dan b
f(x)=9/4 x - 7/4
f(x)=¼(9x-7) ---> Rumus fungsi