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f(-2)=-2a+b=14
f (3) =3a+b=-1
------------------------ -
-5a=15
a=15/-5
a=-3
masukkan nilai a
3a+b=-1
3(-3)+b=-1
-9+b=-1
b=-1+9
b=8
Jadi a=-3 dan b=8
Jika ditanya rumus fungsinya tinggal masukkan nilai a dan b ke rumus dasar fungsi
f(x)=ax+b
f(x)=-3x+8
f(3) = 3a+b = -1
------------------------ --
-a = 15
a = -15
2(-15) + b =14
-30 + b = 14
b = 44