5x + 7y = 1 ax + by = 1 In the given pair of equations, a and b are constants. The graph of this pair of equations in the xy-plane is a pair of perpendicular lines. Which of the following pairs of equations also represents a pair of perpendicular lines? A. 10x + 7y = 1 ax - 2by = 1 B. 10x + 7y=1 ax + 2by = 1 C. 10x+7y=1 2ax + by = 1 D. 5x7y = 1 ax + by = 1

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