55 points for an instant correct answer :)

Consider the function f(x)=[tex]\frac{3x-1}{x+4}[/tex]
part (a):
At which value of x will the function not have a solution? Explain your answer.
Part (b):
If g(x) is a vertical shift of 4 units f(x), write the function of g(x). How does the graph of g(x) compare to the graph of f(x)? Explain the function you wrote.
Part (c):
What is the value of x when g(x)=8? Show your work.
Please explain all the answers please :)