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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 28 2006 
...perpendicular lines on a graph are pretty much for aesthetics only, and a
nice
tiein to geometry. However, in the context of a distance versus time
graph,
perpendicularity is practically meaningless...
I'm not sure that Rene Descartes would completely agree with you, but I get your
point and it is significant area of learning for students. Looking through the
algebra 1 lens there's a strong (maybe too strong) inclination on my part to
keep the X and Y axes the same.
Ihor
 
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