SOLUTION: How do you determine if certain coordinates make a parallelogram?

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Question 498069: How do you determine if certain coordinates make a parallelogram?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
find the slopes of the lines formed by the pairs of points, same slope means parallel lines
___ if the opposite sides are parallel, that's the definition of a parallelogram