SOLUTION: Given just the slop of two lines, how can I tell if they lines are perpendicular? Parallel?

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Question 96461: Given just the slop of two lines, how can I tell if they lines are perpendicular? Parallel?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
IF THE SLOPES OF 2 LINE ARE EQUAL THEN THEY ARE PARRALLEL.
IF THE SLOPES OF 2 LINES ARE NEGATIVE RECIPRICALS (3 & -1/3) THEN THE LINES ARE PERPENDICULAR.