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Mathematics, 21.08.2019 18:00 emilysjuliet110

Ihave been stuck with this one, and i would like to how to solve this.
in each case, determine whether line ab is parallel or perpendicular to cd.
(a) a(0, 0), b(0, 1), c(0, 0), d(1, 0).
(b) a(0, 1), b(2, 3), c(4, 5), d(6, 7).

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Ihave been stuck with this one, and i would like to how to solve this.
in each case, determine...
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