

MCQOPTIONS
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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 | |