1.

If the lines y + px = 1 and y - qx = 2 are perpendicular, then which one of the following is correct?

A. pq + 1 = 0
B. p + q + 1 = 0
C. pq - 1 = 0
D. p - q + 1 = 0
Answer» D. p - q + 1 = 0


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