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f(3)=-1 ⇒ 3a+b=-1 -
-a=2
a=-2
2a+b=1
2(-2)+b=1
-4+b=1
b=1+4=5
3a+b = -1
--------- -
-a = 2
a = -2
dimasukkan rumus yang menurur paling mudah
2a+b = 1
2(-2)+b = 1
-4+b = 1
b = 1+4
b= 5
jadi nilai a dan b berturut2 adalah -2 dan 5