Help with my graphing calculator

[minase]

I was trying to build a program that let's you find the integral and shows you the curve after giving you the solution. And I don't know how to write the code for the calculator to ask you for the y value. I know how to use drawf but you can't set your zoom to zoomfit because your calculator erases the drawing after you graphed the curve. I have a ti84 calc Any ideas?

 

[minase]

Sorry I thought this was the programming section.