about graphing

The main ones that we use is Desmos, it makes beautiful graphs but it does have limitations.

then we use wolfram|alpha

there are others that we pull out very occasionally.

I do not know what I could use for those graphs I drew for you this afternoon - that is why I drew them free hand.

https://www.desmos.com/calculator

http://www.wolframalpha.com/

We also use GeoGebra heavily but that is more for sketches.  It is a program that you can download.     

thank you melody