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g(5) = 5a + b
8 = 5a + b.....(1)
f(2) = 2a + b
-1 = 2a + b......(2)
Metode eliminasi
5a + b=8
2a + b=-1 _
3a = 9
a = 3
kalo b ditany
5a + b =8
15+b =8
b= 15-8=7
g(5)=8 => 5a+b = 8
f(2)= -1 => 2a+b =-1
----------------- -
3a =9
a =9 :3
a =3