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a.3+b =17 -
-5a =-25
5a =25
a =25/5=5
5.3+b=17
15+b=17
b=17-15
b=2
f(1)=5.1+2
=5+2
=7
-8 = -2a + b
f(3) =3a+b
17 = 3a+ b
eliminasi =
-8 = -2a+b
17 = 3a +b
__________ _
25 = -5a
-5 = a
maka, -8= -2.-5+b
-8 = 10 + b
b= -18
f(1) = -5.1-18
= -23