Note: This cannot be used with Internet Explorer.
http://www.meta-calculator.com/online/ Note: This will do matrices and statistics too!
Note: This is a downloadable TI-83 calculator. Click and then follow these instructions:
Click on the red box "Free Resources"
Then "Get Calculator"
Then "Virtual TI graphing calculator"
You will have to download the folder, then unzip the .exe file within the folder.