A nice, well ordered board!
dynamic applets... the board of your classroom never was as clean...
When dynamic applets appeared, you finally could build up a reasoning and prevent that the board in the classroom became a mess.
Stepwise you could fill your board, even show a previous step without using a wiper.
"What if" became easy, because I can easily 'ride' on my graph, even without a toy car and change the equation whenever I want without spoiling the blackboard.
More features
You can add more features to the applet: a table of values, the calculation of a sepatate value etc...
Marvelous material voor 'What if'-questions.
With checkboxes you can control what's shown or hidden.
In a table you can study the limits of a function or the sign of a first degree function or the symmetry of a parabola...
Just: Give the student some room to think for themselves and don't trow it all ont the table yourself at once.