Select the pair of equations whose graphs are perpendicular.

A.) 5x - 8y = 9

12x - 5y = 7

B.) 3x + 6y = 8

y = 3x - 8

C.) y = 2x - 7

x + 3y = 3

D.) 2y = - 3x + 5

2x - 3y = 4

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