1. TI-Nspire App Tutorial
Graphs of Parallel and Perpendicular
Lines

2. Summary
• In this tutorial, you’ll explore the graphs of
Parallel and Perpendicular Lines. The steps in
the tutorial include:
– Creating a Graph Window.
– Creating a Slider.
– Graphing two Parallel Lines linked to the Slider.
– Graphing two Perpendicular Lines linked to the
Slider.

3. Create a Graph Window
Click on the +tool to activate this menu.

4. Create a Slider
By default the keyboard is active. Click on the
Keyboard button to deactivate it.

5. Create a First Slider
Click on Menu. Select Actions > Insert Slider.

6. Configure the Slider
This slider is for m, the slope of a linear function. Configure as
shown. Press OK.

7. Move the Slider
Press and hold the Slider to bring up the option for
moving it. Select Move and reposition the slider.

8. Move the Slider
Move the slider to the location shown.

9. Input the First Linear Function
Activate the Function Entry Line by clicking on + in the
upper-right-hand corner. Input the function shown. Press
Enter.
y = m• x

10. Input the Second Linear Function
Press + to bring back the Function Entry line. Input
the second function, shown above. Press Enter.
y = m• x + 3

11. Graph the Parallel Lines
The graphs of these functions are parallel because
they are both linked to the same slider, which
means they have the same slope.

12. Manipulate the Sliders
Changing the values on the Slider results in two
different graphs, but they are still parallel.

13. Edit the Second Linear Function
Edit the second function. Press the + button on the
upper-right corner to bring up the Function Entry
line. Then press the Up arrow.

14. Edit the Second Linear Function
Modify f2(x) as shown. Press Enter.
y = -
1
m
• x + 3

15. Graph the Parallel Lines
The graphs shown are perpendicular to each other.

16. Manipulate the Sliders
Manipulating the Sliders changes the graphs, but
they remain perpendicular.