The good people at Desmos have made an excellent online graphing calculator even better. It’s incredibly fast and versatile. For example, if you input y = m*x + b, it will automatically ask you if you want to create sliders for “m” and “b”. Here’s an example of a quadratic function with sliders:
There’s even a “Share” button that lets you post your creation to Facebook, Twitter, or Google+. Once you create an account, you can save your graphs online, to be used later. There are countless applications of this product in the math classroom.
Click here to try it out!
Download a brief User’s Guide here.