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)

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