Texas Instruments TI-83 PLUS - Manual (Page 219)

TI-83 Plus Draw Instructions 216
You can use most
DRAW
menu and
DRAW POINTS
menu instructions to
draw directly on a graph, using the cursor to identify the coordinates.
You also can execute these instructions from the home screen or from
within a program. If a graph is not displayed when you select a
DRAW
menu instruction, the home screen is displayed.