The pair of lines 6x^(2)+7xy+lambday^(2)...

The pair of lines `6x^(2)+7xy+lambday^(2)=0(lambda ne -6)` forms a rightangled triangle with `x+3y+4=0` then `lambda=`

A

3

B

`-3`

C

`1//3`

D

`-1//3`

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The correct Answer is:

B

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