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masuk kan nilai x
f(-3)=-3a+b=-23
f (4)=4a+b=19
-------------------------- -
-7a=-42
a=-42/-7
a=6
subtitusikan nilai a
4a+b=19
4(6)+b=19
b=19-24
b=-5
b).
masukkan nilai a dan b ke rumus dasar fungsi
f(x)=ax+b
f(x)=6x-5
c).
f(2)=6.2-5=12-5=7