Texas Instruments TI-83 Plus Manual Book page 37

FnOn (Function On) and FnOff (Function Off)
Commands
You can select or deselect all X-variables and Y-variables using
the
FnOn
1. Press
2. Select
—or—
Select
You can also select or deselect individual Y-variables (you
cannot select or deselect individual X-variables):
1. Press
2. Select
3. Press
4. Select
5. Select
6. Select the Y-variable to turn on.
7. Press
Inequality Graphing for the TI-83 Plus
or command:
FnOff
.
to select all X-variables and Y-variables.
FnOn
to deselect X-variables and Y-variables.
FnOff
.
or
FnOn FnOff
.
.
Y-VARS
.
1: Function
.
.
Page 37