Find the specified asymptotes of the following functions. Recall that asymptotes are lines therefore the answer must be given as an equation of a line.
a) Find the vertical asymptote of the function f(x) = 4/ (x + 5)
b) Find the horizontal asymptote of the function g(x) = (5x^2 - 4)/(x + 1)
c) Find the vertical and horizontal asymptotes of the function f(x) = (3x - 1)/(x + 4)
d) Find the vertical and horizontal asymptotes of the function g(x) = (x + 7)/(x^2 - 4)