In Cabri Jr. for the TI-84 Plus calculator, you can use the Slope tool in the Measure submenu of the Appearance menu to find the slope of a line, segment, or side of a triangle or quadrilateral.
To find the slope, follow these steps:
Press [GRAPH] to select the Appearance menu. Use the
keys to place the cursor on the Measure option. Press
to display the Measure submenu. Use
to place the cursor on the Slope option, and then press [ENTER] to select that option.
A symbol of the Slope tool appears in the upper-left corner of the screen.
Use the arrow keys to move the cursor to the line, segment, or side of a triangle or quadrilateral and press [ENTER].
The slope appears at the location of the cursor.
Use the arrow keys to move the slope to a better location and press [ENTER] to anchor that location.
To find the slope of another line, repeat Steps 2 and 3. When you are finished finding slopes, press [CLEAR] or select another menu item.
This is illustrated in the third picture, where Cabri Jr. found the slopes of the horizontal and vertical segments.
Cabri Jr. uses the symbol ### to indicate that a slope is undefined.
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Source:http://www.dummies.com/how-to/content/how-to-find-the-slope-in-cabri-jr-on-the-ti84-plus.html
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