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Graphing Inequalities with the TI-82

About this program:  ( tiineqgraf ):  This program simplifies graphing inequalities for the TI-82.  The user enters the right side of the inequalities (up to three) in the Y= area as usual.  Then after starting the program, the user tells the calculator whether to shade above the line or below the line.  After each of the first two inequalities, the user is asked whether to quit or graph another inequality.

DISCLAIMER:  This program is free, and, therefore, I make no claims about it's efficacy, efficiency, or proper operation.  If you find a problem with this program, or can suggest an improvement, please e-mail me at knosummath@aol.com  .

Use of this Program:  You may use this program freely for your own personal use and for the use of other students, but use for publication or any means of profit requires my permission.

Memory Usage:  This version of the program uses 322 bytes of memory. I estimate it will take an inexperienced programmer about 15 minutes to enter by hand.

Revisions:  Version:  V1.0  Date:  3/27/05. 

PROGRAM: INEQGRAF
:ClrDraw
:ClrHome
:Disp "F. Kizer", "V1.0 3255"
:Disp "INEQUAL(S) in Y="
:0→C
:Lbl 4
:Menu("Choose","GRPH 1ST INEQ",1,"GRPH ANOTHER",2,"DONE",3)
:Lbl 1
:Lbl 2
:C+1→C
:Input "3 BELO, 4 ABOV ",I
:If I=3 and C=1
:Shade(Ymin,Y1, 2,Xmin, Xmax
:If I=4 and C=1
:Shade(Y1,Ymax, 2, Xmin, Xmax
:If C<2
:Goto 4
:If I=3 and C=2
:Shade(Ymin,Y2, 3,Xmin, Xmax
:If I=4 and C=2
:Shade(Y2,Ymax, 3, Xmin, Xmax
:If C<3
:Goto 4

:If I=3 and C=3
:Shade(Ymin,Y3, 5,Xmin, Xmax
:If I=4 and C=3
:Shade(Y3,Ymax, 5, Xmin, Xmax
:Lbl 3
:DispGraph
:Stop