What is one advantage of using a computer over a graphing calculator?

A computer can show you how it is done and how they got to that solution while a graphing calculator can only show you the solution. 

When you are on a computer there are sites like Google and Bing , and they can help you with over 9.9 billion answers and solutions they also have sites like   :) which are a big help. we show you steps and many solutions and options.

A calculator just gives you the answer and nothing more.  If your lucky you will type in something that has no answer.

so a computer is better. , I hope this helps you :)