1.

The two planes represented by 12 x ^(2) - 2y ^(2) - 6z^(2) - 7 yz + 6zx - 2 xy =0 are

Answer»

`2x + y + 2Z = 0,6 x-2y + 3Z =0`
`2x -y + 2z =0,6 x + 2y - 3z =0`
`2x - y + 2z + 4=0,6x + 2y - 3z =0`
`2x -y + 2z = 0,6 x + 2y - 3z + 1=0`

ANSWER :B


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