Question 762468
Inverse, means one undoes the other.  


If y=f(x), then f(x) = y


Assume there is also a function g(x).  
If g(x) is input for f(x), OR if f(x) is input for g(x), and if g(f(x))=x and f(g(x))=x, then g(x) is the inverse function of f(x).  See, one function undoes the other.  You can also say, f(x) and f^(-1)(x) are inverses.  


Now you ask if {{{f(x)=(3-x)/(x)}}} and {{{f^(-1)(x)=(3)/(x+1)}}} are inverses.
Just use the idea of one of them being inverse of the other.
Fill this form:  {{{f(f^(-1))=(3-(f^(-1)(x)))/(f^(-1)(x))}}}
{{{f(f^(-1))=(3-(3/(x+1)))/(3/(x+1))}}}=?


If the result is x, then these two function ARE inverses.
(Actually, you also need to check f(x) as input for the f^(-1) also to be certain).