Hi,re TY, Yes, A is correct choice. 

Find:  

f(x)=1/2x-2   ||using y for f(x)

 y = x/2 - 2    ||'switching' the y and the x to find the inverse

 x = y/2 - 2

 x + 2 = y/2    || solving for y

 2x+4 = y

 

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