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  Line Parameters

  % Finding slope, y-intercept and other line-parameters from
    line drawn on plot.
    1. press down button-3 at the first corner of a line-segment.
    2. hold down the button and move to the opposite corner of the 
       line-segment.   
    3. release button-3.
    *  A line-parameter report is printed out to standard output.
    *  The report gives the line-parameters of the
         defined line segment: slope, y-intercept, x-intercept and
         other parameters.
    *  For a single press and release, only x and y are reported.
