TI-Nspire App Tutorial

The Point-Slope Form

Summary

• In this tutorial, you’ll be exploring the concept of the Point-Slope Form. The steps in the tutorial include:

– Creating a Graph Window.

– Adding a point.

– Creating a Slider.

– Linking a function in Point-Slope form to the point and Slider.

Create a Graph Window

Click on the + tool to activate this menu.

Deactivate the Keyboard

By default the keyboard is active. Click on the Keyboard button to deactivate it.

Select the Geometry Tools

Click Menu. Then select Geometry > Points & Lines > Point.

Place One Point Onscreen

Click anywhere onscreen to place the point.

Display the Coordinates

Press once on the point. Then press again to bring up the Coordinate option. Select it to display the coordinates.

Display the Coordinates

The coordinates on your screen will likely differ from the ones shown here.

Link the Coordinates

Link the coordinates to variables x1 and y1, which will be used in the Point-Slope Form. Click twice on the x-

coordinate to bring up the Store option.

Link the Coordinates

Link the x-coordinate to variable x1. Press Enter.

Link the Coordinates

Repeat with the y-coordinate. Click twice on it to bring up the Store option.

Link the Coordinates

Link to the variable y1. Press Enter.

Create a Slider

Click on Menu. The Points & Lines Tools are showing. Click on the upper-left part of the menu:

Points & Tools > Tools > Actions

Create a Slider

Click on Insert Slider.

Configure the Slider

Configure the Slider as shown. This Slider will control the slope in the Point-Slope Form. Press OK.

Move the Slider

Press twice on the Slider to activate the Move option. Select Move.

Move the Slider

Position the Slider in the location shown.

Input the Point-Slope Form

Press the + sign in the upper-right-corner of the screen to bring up the Function Entry line.

Input the Point-Slope Form

Input the function shown. This is the Point-Slope Form, linked to the variables you stored. Press Enter.

Graph the Point-Slope Form

The graph shown has the slope defined by the Slider and crosses the point you created.

Manipulate the Slider

Changing the values on the Slider will create a new graph, but it will still intersect the point.

Move the Point

You can also relocate the point to a different part of the screen, but the linked function will ensure it

intersects the point at its new location.