Pre-Calculus Programs v. 1.0

Jeremiah Walgren   XD_Y2K@juno.com

This is a collection of programs that were taken from my Pre-Cal book.  I was
bored one day in math and decided to program them on my 89.  Then I used the
graph-link software and did the rest of them.  I was only able to test the 89/
92/92 Plus and the 83/83 Plus versions so if you find any problems with any of
them please contact me.

The following is a list of the programs and how to use them.  Because of certain
built in functions for some of the calcs, program names may differ.  If you have
any problems figuring out which is which, you may e-mail me.  The descriptions
were taken from the book so they may not seem clear.  If you need any help with
working any of the programs, please feel free to e-mail me and I'll see if I can
help you with it.

If you have the book then please look in there!

addvect - This program will sketch two vectors in standard position.  Using the
parallelogram law for the vector addition, the program also sketches the vector
sum.  Be sure to set an appropriate viewing rectangle.

angdraw - An angle drawing program, can be used to draw several different angles
in either radian or degree mode.

darts - simulates the throwing of darts.

parabola - This program will sketch a graph of the function y=R(x+H)^2+V, where
R=+1 or -1, H is an integer between -6 and 6, and V is an integer between -3 and
3.  This program gives you practice working with reflections, horizontal shifts,
and vertical shifts.

reflect - This program will graph a function f and its reflection in the line
y=x.  To use this program, enter function in Y1 and set a viewing rectangle.

rowops - This program demonstrates how elementary matrix row operations used in
Gauss-Jordan elimination may be interpreted graphically.  It asks the user to
enter a 2 x 3 matrix that correspnds to a system of two linear equations.  (The
matrix entries should not be equivalent to either vertical or horizontal lines.
This demonstration is also most effective if the y-intercepts of the lines are
between -10 and 10.)
    While the demonstration is running, you should notice that each elementary row
operation creates an equivalent system.  This equivalence is reinforced graphically
because while the equations of the lines change with each elementary row operation,
the point of intersection remains the same.  You may want to run this program a
second time to notice the relationship between the row operations and the graphs of
the lines of the system.
   For the 82/83/83+/83+SE:  to use this program, dimension matrix [A] as a
2 x 3 matrix.  Press [ENTER] after each screen display to continue the program.
   For the 85/86:  to use this program, dimension matrix TEMP as a 2 x 3 matrix.
Press [ENTER] after each screen display to continue the program.
   For the 89/92/92+:  Press [ENTER] after each screen display to continue the program.

sineshow - The program will simultaneously draw a unit circle and the corresponding
points on the sine curve.  After the circle and sine curve are drawn, you can connect
the points on the circle with their corresponding points on the sine curve by pressing
[ENTER].

solve - This program will display the solution of a system of two linear equations in
two variables of the form ax+by=c and dx+ey=f if a unique solution exists.

sum - To use this program, first store the nth term of the sequence in Y1 (in terms of
X).  Due to special characters, a more detailed description of how to use this program
would be long.  I don't feel like writing it.  But if you must, please e-mail me and
I'll try to explain it.

vecangl - The program will sketch two vectors and calculate the measure of the angle
between the vectors.  Be sure to set an appropriate viewing rectangle.

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Pre-Calculus with Limits
A Graphing Approach
-Second Edition-

Roland E. Larson - The Pennsylvania State University The Behrend College
Rovert P. Hostetler - The Pennsylvania State University The Behrend College
Bruce H. Edwards - University of Florida
	with the assistance of
David E Heyd - The Pennsylvania State University The Behrend College

Houghton Mifflin Company

For more information on the text book, please contact Jeremiah Walgren at:

	XD_Y2K@juno.com