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Mathematics 21 Online
OpenStudy (anonymous):

Select the pair of equations whose graphs are perpendicular 2x - 8y = 9 12x - 3y = 7 3x + 6y = 8 y = 2x - 8 y = 2x - 7 x + y = 3 2y = - 3x + 5 2x + 3y = 4

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