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Topic:  Runners Activity: Some Observations 
Related Item:  http://mathforum.org/mathtools/tool/13171/ 
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Subject:  RE: Runners Activity: Some Observations 
Author:  ihor 
Date:  Jun 26 2006 
The distance between 0 and 10 on the time scale is not the same as the
distance between 0 and 10 on the position scale. This means that while it
is
easy to make parallel lines, it is extremely difficult to make perpendicular
lines.
Ihor writes:
Especially since you are trying to do it in an arena where the x and y units are
not the same. The usual way to get linear equations to be perpendicular is to
have one slope be the negative reciprocal of other. With the limitation of the
stepping that only works when the step size is 1, but only if the X and Y unit
intervals are the same.
Interesting!
 
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