Which pair of equations when graphed has lines that are perpendicular?

A. Y = 2x - 7

X + 3y = 3

B. 2y = - 3x + 5

2x - 3y = 4

C. 5x - 8y = 9

12x - 5y = 7

D. 3X + 6Y = 8

Y = 3x - 8

What is the answer to 11•11

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Solve the following equation for m - 2m+7=11