Texas Instruments TI-83 PLUS - Manual (Page 235)

TI-83 Plus Draw Instructions 232
Using Pen to Draw on a Graph
Using Pen to Draw on a Graph
Pen draws directly on a graph only. You cannot execute Pen from the
home screen or a program.
To draw on a displayed graph, follow these steps.
1. Select A:Pen from the
DRAW
menu.
2. Place the cursor on the point where you want to begin drawing. Press
Í to turn on the pen.
3. Move the cursor. As you move the cursor, you draw on the graph,
shading one pixel at a time.
4. Press Í to turn off the pen.
For example, Pen was used to create the arrow pointing to the local
minimum of the selected function.
Note: To continue drawing on the graph, move the
cursor to a new position where you want to begin
drawing again, and then repeat steps 2, 3, and 4. To
cancel
Pen , press ‘ .