These instructions and suggested activities also appear on the html page with the applet. They are repeated here for easy viewing and printing.
Click and drag the red and orange arrows to change the matrix A of the linear transformation.
(Alternatively, you can set the matrix by using the text boxes below the applet.)
You can show or hide points on the screen by using the checkboxes.
Drag the points u, v, w... around to see how their images Au, Av, Aw... change.
Note for Windows users:
Ctrl + [click and drag] on the background to move the coordinate axes around.
Ctrl + [scroll wheel] to zoom in and out.