If f(x)=-2x+3 and g(x)= 1/2x -8, which statement is true?

A) f(-2)-g(-2)=-2

b) f(-2)-g(-2)= 2

c) f(-2)+g(-2)=-2

D) f(-2)+g(-2)=2

Now i have no idea what to do here, if anyone could explain how they got the answer, it would be appreciated, thank you!