SOLUTION: How can you determine if two lines of perpendicular?

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Question 151992: How can you determine if two lines of perpendicular?
Answer by Earlsdon(6287) About Me  (Show Source):
You can put this solution on YOUR website!
You compare their slopes.
If their slopes are equal, then the lines are parallel.
If their slopes are negative reciprocals (like 3 and -1/3), then the lines are perpendicular.
If their slopes are neither or the above, then the lines are neither parallel nor perpendicular, which means that the lines must intersect, if they are co-planar (lying in the same plane).