If the lines y + px = 1 and y - qx = 2 are perpendicular, then which o – 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

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