Purpose: SCATRBOX is a freeware program distributed at a stat teacher workshop on 12/5/2001. By adding the following lines to the end of the program, you can get your TI-83 (or TI-83 Plus) to tell you the equation of the LSRL at the end.

Note 1: Because the LSRL is shown on the main display as a line, not a TRACE-able object, it is not straightforward to display the equation while the main display is active. You would have to re-order the lines of code in the program and use a small display font, which would take a bit more effort than the simple modifications shown below.

Note 2: The lowercase letters "a", "b", and "r" shown below are obtained from the VARS menu. Key in VARS 5 (Statistics), choose EQ, and then choose 2, 3, or 7, respectively. Everything else, including the equal signs, should be available under the 2nd CATALOG menu.