Make your own Graphs
Explore the wonderful world of graphs. Create your own, and see
what different functions produce. Get to understand what is really
happening.
What type of Graph do you want?
Function Grapher and Calculator 
Equation Grapher 
Make a Bar Graph, Line Graph or Pie Chart 
Print or Save Blank Graph Paper 
You can explore ...
... the properties of a Straight Line
Graph 

... the properties of a Quadratic Equation Graph 

And also:
Try some Sample Graphs 

Make up a function like you use a calculator,
then graph the result 
