If you are not able to afford a TI-83/84 Graphing Calculator, I have found another option for you to practice below. I found a site that lets you download the TI-83 graphing calculator onto laptop, i-pad, or i-phone. The site below is very consistent with laptops (PC's), it acts a little funny with apple products. Downloading it will be great for the short term; long term, you will need to purchase the device.

Download these files on this link to your computer (this is the exact TI-83 I use in class)

1) 12 Steps to downloading a GREAT graphing calculator
(This is the one I use, it is very good)

 2) Downloadable Graphing Calculator

3) YouTube tutorial on how to download the online TI-83 calculator 

Site to download Online TI-83 Calculator

Virtual Ti-83 Graphing Calculator 


4) Downloadable Graphing Calculator on Android