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Q.

Two straight lines u = 0 and v = 0 passes the origin and the angle between them is tan−179 . If the ratio of slopes of v = 0 and u = 0 is 92 , then their equations are

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a

y=3x and 3y=2x

b

2y=3x and 3y=x

c

y+3x=0 and 3y+2x=0

d

2y+3x=0 and 3y+x=0

answer is A.

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Detailed Solution

m1m2=92, m1−m21+m1m2=±79⇒9m22−9m2+2=0, 9m22+9m2+2=0m2=23,13&m2=−23,−13
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