Operation Manual

3-6 Function Graphing

8203FUNC.DOC TI-82, Chapter 3, English Bob Fedorisko Revised: 02/09/01 9:06 AM Printed: 02/09/01

12:36 PM Page 6 of 24

Editing a Function

1. Move the cursor to the function in the

list you want to change.

2. Make the changes. You can press

‘

to erase the expression and

then enter a new expression.

The expression is stored as one of the ten user-defined functions in the

list as you enter it.

Clearing a Function

To clear or erase a function on the

edit screen, position the cursor

anywhere on the function, and then press

‘

Defining Functions from the Home Screen or a Program

1. Begin on a blank line. Press

, enter the expression, and then

press

again.

2. Press

3. Press

VARS

, select

Function...

, and then select the name of the

function, which is copied to the cursor location.

4. Press

to complete the instruction.

expression

When the instruction is executed, the TI

82 stores the expression to the

list, selects the function, and displays the message

Done

Evaluating Y= Functions in Expressions

You can the calculate the value of a

function at a specified value of

For example, if

=.2X

–2X+6