Question

http://prntscr.com/cnfln2

Answer 1

the variable x, goes to x+4 instead..

\[y = f(x - a) =\frac{ 1 }{ x-a }\]
if you have the input change x by a value 'a', the graph will shift horizontal by 'a' units

Answer 2

\[y = \frac{ 1 }{ x-(-4) }\]

see the 'a' value is -4 here, the graph shifts -4 in the x direction