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if a(1, 1), b(5, 4), c(10, 3), and d(6, 0) are the vertices of a quadrilateral, do the points form a parallelogram? justify your answer.

yes, it is a parallelogram because the slope of segment ab equals the slope of segment dc, which equals negative start fraction three over four end fraction comma and ad = bc = 5 units.
yes, it is a parallelogram because the slope of segment ab equals the slope of segment dc, which equals start fraction three over four end fraction comma and ab = cd = 5 units.
yes, it is a parallelogram because the midpoint of the diagonals segment ac and segment bd is (5.5, 2).
no, it is not a parallelogram because the slope of segment ab = 1 and the slope of segment dc equals negative start fraction three over four end fraction full stop