How would I write a rational function for this graph?

Lexi

New member
I'm having difficulty trying to write a rational function for a graph. I don't know where to begin. It would be great if you took me step by step on writing one.

http://i87.photobucket.com/albums/k144/gina_910/4755d9c8-18f0-45d0-8b87-c97a8d641ea.gif
 
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