Posted by shansen1@pacbell.net (64.175.104.185) on October 03, 2003 at 19:38:12:
In Reply to: slope question! posted by on October 03, 2003 at 17:33:03:
In Cartesian coordinates, the product of the slopes of two perpendicular lines is -1, so the slope of a line perpendicular to a given line is the "negative recriprocal" of the slope of the given line. In this case
(-7/8)*(8/7) = -1