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Verified answer
A)f(5)=5a+b=23
f(2)=2a+b=14(-)
3a=9
a=9/3
a=3
5a+b=23
5.3+b=23
15+b=23
b=23-15
b=8
jadi a=3 dan b=8
b) f(x)=ax+b
c) f(12)=12a+b
=12.3+8
=36+8
=44