Texas Instruments TI-83 PLUS - Manual (Page 114)

TI-83 Plus Function Graphing 111
Defining Functions
Displaying Functions in the Y= Editor
To display the Y= editor, press o . You can store up to 10 functions to
the function variables Y 1
through Y 9
, and Y 0
. You can graph one or more
defined functions at once. In this example, functions Y 1
and Y 2
are
defined and selected.
Defining or Editing a Function
To define or edit a function, follow these steps.
1. Press o to display the Y= editor.
2. Press † to move the cursor to the function you want to define or edit.
To erase a function, press ‘ .
3. Enter or edit the expression to define the function.