This Math image should be recreated using vector graphics as an SVG file. This has several advantages; see Commons:Images for cleanup for more information. If an SVG form of this image is already available, please upload it. After uploading an SVG, replace this template with template {{SupersededSVG|new image name.svg}} in this image.
Shows the definition of the (numerical) slope of a straight line in a 2D coordinate system, along with two points and a perpendicular line with its own -1/a slope
Drawn using the "Autoshape" features in MS Word '97, then converted to PNG in a graphics tool.
I, the author of this work, hereby publish it under the following license: