[Graph](https://i.stack.imgur.com/czgKW.png)

Based on the graph, I need to find the equation.
What I know: vertical asymptote x = 4, and opening at x = -4.
I am struggling to find the rational function of the graph. y = 1/-x+4 is what I have currently, but I don`t know how to include the opening to the equation. What can I do?