Texas Instruments TI-83 Plus Manual Book page 32

Use options on this screen ... To do this:
MAIN displays the main menu.
NEW displays the equations/unknowns
entry screen where you can view or change
the number of equations and number of
unknowns.
SYSMATRIX screen
CLR clears all of the matrix values that you
have entered. (Pressing does not
clear the matrix values.)
LOAD displays a prompt so that you can
enter a matrix name that contains the
matrix values you want to use. You must
set up the matrix in the matrix editor before
you can use it in the Simultaneous
Equation Solver application. You cannot
access the matrix editor while the
application is running.
SOLVE solves the system of equations.
The entire solution may not fit on one
screen. If an arrow is displayed on the left
side of the screen, press and as
necessary to view the entire solution.
Each line of the matrix may not fit on the
screen. Press scroll to the right to view
the part of the line that is off the screen..
TI-83 Plus Polynomial Root Finder / Simultaneous Equation Solver Application Page 32