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f(-2)= -7
a(-2)+b= -7
-2a+b= -7
f(3)= 8
a(3)+b= 8
3a+b=7
-2a+b= -7
3a+b= 8
--------------- -
-5a = -15
a= 3
-2(3)+b= -7
-6+b= -7
b= -1
Rumus: f(x)=3x-1
f(2)=3(2)-1
=6-1
=5