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f(3)= a.3+b
11=3a+b
f(1)=a.1+b
7=a+b
7-b=a
substitusi a ke 11=3a+b menjadi :
11=3(7-b)+b
11=21-3b+b
11-21=-2b
-10=-2b
5=b
substitusi b ke 7-b=a menjadi :
7-5=a
2=a
jadi, nilai a dan b = 2 dan 5