Texas Instruments TI-83 Manual Book page 147

Drawing a Line
from the Home
Screen or a
Program
(horizontal line) draws a horizontal line at
Horizontal
y can be an expression but not a list.
y
Horizontal
(vertical line) draws a vertical line at
Vertical
an expression but not a list.
x
Vertical
To instruct the TI-83 to draw more than one horizontal or
vertical line, separate each instruction with a colon (
=x. x can be
X
Instructions 8-7
DRAW
=y.
Y
).
: