Texas Instruments TI-89 Manual Book page 232

Drawing a
Horizontal or
Vertical Line
Tip: Use 2 t o move the
cursor in larger increments;
2 B , etc.
Drawing a Tangent
Line
Tip: To set the tangent
point, you can also type its x
value and press ¸ .
Drawing a Line
Based on a Point
and a Slope
From the Graph screen:
2 ‰
1.
TI-89:
‰
TI-92 Plus:
and select 5:Horizontal
and a flashing cursor are displayed on the screen.
If the line is initially displayed on an axis, it may be difficult to
see. However, you can easily see the flashing cursor.
2. Use the cursor pad to move the line to the appropriate position.
Then press ¸.
After drawing the line, you are
still in "line" mode.
¦
To continue, move the cursor
to another location.
¦
To quit, press N.
To draw a tangent line, use the ‡
Graph screen:
1. Press ‡ and select
2. As necessary, use D and C to select the applicable function.
3. Move the cursor to the
tangent point, and press
¸.
The tangent line is drawn,
and its equation is displayed.
To draw a line through a specified point with a specified slope,
execute the command from the Home screen or a program.
DrawSlp
Use the syntax:
DrawSlp x, y, slope
You can also access DrawSlp
2 ˆ
1.
TI-89:
ˆ
TI-92 Plus:
and select
6:DrawSlp
DrawSlp in the entry line.
2. Complete the command, and
press ¸.
The
TI-89 / TI-92 Plus
automatically switches to the
Graph screen and draws the
line.
or 6:Vertical . A horizontal or vertical line
toolbar menu. From the
Math
.
A:Tangent
from the Graph screen.
. This switches to the Home screen and puts
DrawSlp 4,0,6.37
Chapter 12: Additional Graphing Topics 215