Number the pixels in a 3x3 bitmap like this:
2 5 8
1 4 7
0 3 6
Draw a "+'" sign in a 3x3 grid like this:
The number representing that bitmap is given by N above.
Draw the equation below (by clicking on the "X" and selecting a color) to see the other bitmaps around the "+"


Graph of the formula

This file was created by Graphing Calculator 3.5.
Visit Pacific Tech to download the helper application to view and edit these equations live.