Sarthaks Test
+2 votes
in JEE by (150 points)


If the pair of lines ax2+2hxy+by2+2gx+2fy+c=0 intersect on the y-axis then 

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1 Answer

+2 votes
by (21.2k points)

Solution: Put x=0 in the given equation


For unique point of intersection.



Since abc+2fgh−af2−bg2−ch2=0

=> 2fgh−bg2−ch2=0

Hence A is the correct answer.

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