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f(-5)= -5a+b= -33
------------------------ (-)
7a = 35
a = 35:7
a = 5
2a+b=2
2(5)+b=2
10+b=2
b = 2 - 10
b = -8
f(2)=2
f(-5)=-33
2a+b = 2
-5a+b= -33
_______________________________________________-
7a = 35
a = 5
2a+b=2
10+b=2
b=-8
Jadi a=5 dan b= -8
sudaaaah^^ maafkan ya kalau salaaah^^