If the pairs of lines x^2+2x y+a y^2=0 a...

If the pairs of lines `x^2+2x y+a y^2=0` and `a x^2+2x y+y^2=0` have exactly one line in common, then the joint equation of the other two lines is given by (a) `3x^2+8x y-3y^2=0` (b)`3x^2+10 x y+3y^2=0` (c)`y^2+2x y-3x^2=0` (d) `x^2+2x y-3y^2=0`

A

`3x^2+8xy-3y^2=0`

B

`3x^2+10xy+3y^2=0`

C

`x^2+2xy-3y^2=0`

D

`3x^2+2xy-y^2=0`

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The correct Answer is:

b

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