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Q.

The combined equation of the pair of lines passing through origin which are at a distance 4 units from the point (5, 6) is

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a

9x2+60xy−20y2=0

b

9x2−60xy+20y2=0

c

20x2+60xy−9y2=0

d

20x2−60xy+9y2=0

answer is D.

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Detailed Solution

(βx−αy)2=d2(x2+y2) where (α,β)=(5,6) and d=4
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