Drawing Horizontal And Vertical Lines - Texas Instruments TI-80 Manual Book

Drawing Horizontal and Vertical Lines

While a graph is displayed, HORIZONTAL and VERTICAL let you define lines on
the graph using the cursor. If a graph is not displayed, the instruction is copied
to the Home screen.
Directly on a
Graph
From the Home
Screen or a
Program
To draw horizontal and vertical lines directly on a graph:
1. When a graph is displayed, select
or (item 4) from the
VERTICAL
2. A line is displayed that moves as you move the cursor.
Position the cursor where you want to draw the line. Press
¸. The line is drawn on the graph.
To continue to draw lines, repeat step 2. To cancel
or
HORIZONTAL VERTICAL
HORIZONTAL ( DRAW DRAW
at Y =Y (which can be an expression, but not a list).
HORIZONTAL Y
VERTICAL ( DRAW DRAW
X =X (which can be an expression, but not a list).
X
VERTICAL
Note: In the example above, the horizontal line is drawn first,
and then the vertical line is drawn.
HORIZONTAL
DRAW DRAW
, press M .
, item 3) draws a horizontal line
, item 4) draws a vertical line at
Draw Operations 7-5
(item 3)
menu.