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Mathematics 16 Online
OpenStudy (anonymous):

The coordinates of A, B, C, and D are A (-6, 1), B (-9, 4), C (-1, 1), and D (-7, 6). How are AB and CD related? A)They are parallel lines. B)They are intersecting lines but are not perpendicular. C)They are perpendicular lines. D)They are coincident lines.

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