If the equation 12x^2+7xy-py^2-18x+qy+6=0 represents a pair of perpendicular straight lines, then

JEE Main Mathematics question

If the equation represents a pair of perpendicular straight lines, then

Answer: (A)

Perpendicular lines need the sum of the coefficients of and to vanish: , so . With , , , , \frac$

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Question ID VK-024637