Some of the more common analyses that are performed on a graphed function on the TI-Nspire include evaluation, finding local maximum and minimum values, and locating zeros. The Point On tool offers a convenient way to accomplish each of these tasks. Here are the steps for using the Point On tool:

Press [MENU]→Points & Lines→Point On to open the Point On tool.

Use the Touchpad to move the cursor and click on the graph.

A ghosted image of the coordinates at this location appears along with the words

*point on**.*Press [ENTER] or [CLICK] to create the point.

Press [ESC] to exit the Point On tool.

Hovering over the tool icon in the upper-left corner of the screen gives tooltips for how to operate each tool on a Graphs page.

Now move over the point until the grabbing hand symbol appears, and press **[CTRL][CLICK]** to grab the point. Using the Touchpad, move your point along the graph. Notice that when you approach a local maximum value, the word *maximum* appears accompanied by the coordinates of this local extreme value.

As you pass through a local minimum, you see the word *minimum**.* As you pass through a zero (*x*-intercept) the word *zero* appears.

By default, the coordinate points are given with three significant digits. To change the level of precision, hover your cursor over the *x*-coordinate so that the grabbing hand symbol appears and the coordinate blinks. Press the **[+]** key repeatedly to increase the number of displayed digits, and press the **[–]** key to decrease the number of displayed digits. Repeat this process for the *y*-coordinate.

As you hover the cursor over the *x*-coordinate, try clicking **[CLICK]**** **twice to allow editing of the *x*-coordinate. Type a new *x*-coordinate value and press **[ENTER]**. Watch the point jump to its new location. You can also edit the *y*-coordinate.

For functions that are not one to one (meaning in some instances that the *y*-values are not unique), TI-Nspire jumps to a point with the specified *y*-value closest to the current location.