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f(x):ax+b
f(2):a(2)+b
:2a+b
f(2):5
maka f(x) : 2a+b=5
f:5=8
f(5) =a(5)+b
:5a+b
f(5):8
maka f(x) : 5a+b =8
dari 1 & 2
2a+b=5
5a+b=8
_______ -
-3a. =-3
a. = -3
------
-3
= 1
kalau ga salah gini