Gas laws graphs
Three graphs record the relationships between
pressure and volume
pressure and temperature
volume and temperature 

Try looking at graphs where both parameters are changing - and the parameter not shown is unchanging.

Adjust the slider controls slowly to trace out graphs. Sometimes you may want to wait for conditions to settle after making a change, then note down the parameter values (under the slider controls) to draw your own graphs.

Can you work out any rules governing gas behaviour?