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= 3a +b=1
f(1 )=a ( 1)+b=-1
= a+b=-1
kurangkan
3a + b=1
a + b = -1_
=2a=2
a=1
subtitusikan ke pers. 1
3a +b=1
3(1) + b=1
3+b=1
b= 1-3
b=-2
b.f(3)= a (3) + b
= 3a +b=1
f(1 )=a ( 1)+b=-1
= a+b=-1
c. f(-2)= a(-2)+b
= - 2a+ b