Chapter 9: Function Graphing 167
7309ENG.DOC CH 9 Function Graphing, English Julie Hewlett Revised: 07/29/98 12:14 PM Printed: 05/19/99
9:01 AM Page 167 of 24
Defining Functions in the Y= Editor &
Use the Y= editor to define up to four functions, Y1, Y2, Y3, and
Y4, in terms of the independent variable, X.
Press & to display the Y= editor. The TIN73 graphs up to four
defined functions at the same time.
If the result of an expression is not a real number, that point is
not plotted. You do not get an error.
&

Entering FunctionsEntering Functions

Functions can consist of variables, lists, trigonometric or
logarithmic expressions, or variations of already defined
functions (for example, Y2=2¦Y1). Access a Yn variable by
pressing - } 2:Y-Vars.
Define Y2=3X+5.
1. Display the Y= editor.
&
2. Move the cursor to the
function that you want to
define, Y2.
#
3. Clear Y2, if necessary.
:
4. Enter Y2=3X+5.
3I\5
³
If you tried the chapter
example problem, then Y1=2X.