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Q.

If the lines y = – 3x + 4, ay = x + 10 and 2y + bx + 9 = 0 represent three consecutive sides of a rectangle then ab =

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a

18

b

-3

c

12

d

-13

answer is A.

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Detailed Solution

Let the given sides are AB, BC, CDAB||CD⇒b=6AB⊥BC⇒a=3
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