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f(3) = a(3)+b
f(-1)= a(-1)+b
f(3)=3a+b
f(-1)=-a+b
dikurangin
=(3a- (-a)) (b-b)
=4a
a=4
f(3)=3a+b
f(3)=3(4)+b
f(3)=12+b
b=12/3
b = 4
f(4)=ax+b
f(4)= (4)(4)+4
f(4)=16+4
f(4)=20
MAAF KALAU SALAH