Texas Instruments TI-89 ユーザーズマニュアル

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Additional Graphing Topics
 495
2. As necessary, use 
D and C to select the applicable function.
Note:
 To set the tangent point, you can also type its 
x
 value and press 
¸.
Drawing a Line Based on a Point and a Slope
Drawing a Line Based on a Point and a Slope
Drawing a Line Based on a Point and a Slope
Drawing a Line Based on a Point and a Slope
To draw a line through a specified point with a specified slope, execute the 
DrawSlp
 
command from the Home screen or a program. Use the syntax:
DrawSlp
 
x
y
slope
You can also access 
DrawSlp
 from the Graph screen.
1.
2 ˆ 
and select 
6:DrawSlp
. This switches to the Home screen and puts 
DrawSlp
 in the 
entry line.
3. Move the cursor to the tangent point, and 
press 
¸.
The tangent line is drawn, and its 
equation is displayed.
2. Complete the command, and press 
¸.
The calculator automatically switches to 
the 
Graph
 screen and draws the line.
DrawSlp 4,0,6.37