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Ditanya rumus f(x) ?
Dijawab:
f(1)=-3
a+b=-3...pers. 1
f(4)=3
4a+b=3...pers2
Eliminasi pers 1 dan 2
a+b=-3
4a+b=3
----------- -
-3a=-6
a=2
subsitusikan a ke salah satu pers.
a+b=-3
2+b=-3
b=-5
Masukan a dan b ke f(x)
f(x)=ax+b=2x-5