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f(3)= a.3 + b = 8 f(-2)= a.-2 + b= -7
sehingga menjadi
3a + b = 8
-2a + b = -7
keduanya di kurangi menjadi
5a = 15
a = 15 : 5
a = 3
sehingga didapat a = 3
mencari b
3a + b = 8
3.3 + b = 8
9 + b = 8
b = 8 -9
b = -1
maka didapat b= -1
jadi nilai a dan b berturut" adalah 3 dan -1