Thank you for the opportunity to help you with your question!
You'r question is incomplete. Where is " this function"? I'll try to give an example here instead and walk you through all the steps. If you want further explanation you can post a comment anytime.
Question: how is the graph of 3/x function related to its parent function y=(1/x) ?
As you can see, 1/x is blue in color and 3/x is in purple. f(x)= a (1/x), "a" either stretches or compresses the graph. Here a= 3, therefore 3/x is vertically stretched by the factor of 3 from its parent function (1/x)
Please let me know if you need any clarification. I'm always happy to answer your questions.