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if the equation 12x^2+7xy-py^2-18x+qy+6=...

if the equation `12x^2+7xy-py^2-18x+qy+6=0` represents two perpendicular lines , then the value of p and q are

A

`(12,1)`

B

`(1,12)`

C

`(-1,12)`

D

`(-12,1)`

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A
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