If 6x^2+11xy-10y^2+x+31y+k=0 represents ...

If `6x^2+11xy-10y^2+x+31y+k=0` represents a pair of straight lines,
then k is equal to.

A

(a) `-15`

B

(b) `6`

C

(c) `-10`

D

(d) `-4`

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The correct Answer is:

A

NA

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