Posted by 14 on Saturday, September 25, 2010 at 7:27am.
how can you tell in geometry that the equations are parallel, perpendicular , neither, either?

geometry  Reiny, Saturday, September 25, 2010 at 8:02am
If the slopes of the lines are equal, the lines are parallel
if the slopes are negative reciprocals of each other, the lines are perpendicular, ( e.g. 5/3 vs 3/5)

geometry  bignig, Monday, November 30, 2015 at 10:04pm
parell is when lines are black
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