[TIPS] Descartes - maybe the ONE applet you'll ever need

http://descartes.cnice.mecd.es/ingles/presentacion/El applet Descartes.htm

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Descartes is an applet (a program written in Java) which can be configured. It has been designed to present educational interactive tasks with numbers, functions and graphs. Descartes can be used by creators of educational Web pages as a means of supplementing their material with a wide variety of interactive mathematic models.

Teachers can use Descartes to produce their own interactive Web pages, which cover a wide variety of subject areas within mathematics. For example, the following parabola graph has been created using the Descartes applet.
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A QUICK tutorial

Once the applet loads, click the Config button in the top right corner.
Click the various radio buttons near the top of the resulting window to gain access to the variables and formulas
NOTE the animation button!!