SOLUTION: are the line (-20,5)and (-4,7) and the line through (5,-5) and (7,4) parallel, perpendicular or neither?

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Question 979773: are the line (-20,5)and (-4,7) and the line through (5,-5) and (7,4) parallel, perpendicular or neither?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
are the line (-20,5)and (-4,7) and the line through (5,-5) and (7,4) parallel, perpendicular or neither?
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Find the slope of each line, m1 & m2.
If m1 = m2 --> parallel (or coincident)
If m1 = -m2 --> perpendicular
o/w neither.