Understanding the Slope of a Line
The purpose of this applet is to understand the notion of "the
slope of a line". Use this applet as follows:
- If you get lost, look in the "MESSAGES" area, you will always
be told what to do next. Error messages will also be displayed there.
- Double-click in the grid area to get a first point. Note that once you have
selected a point, its coordinates will appear on the left of the applet window,
under POINTS.
- Double-click a second time to get a second point. Several things will then
happen. First, the coordinates of the new point will appear on the left of
the applet window, under POINTS. Then, the quotient rise / run and the value
of the slope will be displayed on the left of the applet window, under SLOPE.
Finally, the line through the two points will be drawn as well as the triangle
symbolizing the rise and the run.
- You can now click on either point and drag it along the line. You will see
the point move, the triangle will be redrawn, the coordinates of the point
being dragged will be updated. The slope should remain the same.
- If you either click outside the grid area, or try to drag anything other
than one of the point, an error message will be displayed.
This applet was developed by Dr. Philippe
B. Laval, at Kennesaw State
University.
This work was funded in part by:
The National Science Foundation # DUE-9952568
The US Department of Education FIPSE #P116B00178