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Mathematics 12 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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