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I have these 3 equations. I tried to use wolfram alpha to graph in 3d, but did't succeed.

1) $x^2 + 2y^2 - 6x + 4y + 7 = 0$
2) $z^2 - 4z - 6x = 2$
3) $z = -y + 2$

I think that:
1) is a cylinder
2) is a cylinder
3) is just a sheet/plane

How close am I?

EDIT:

I also have: $x^2 + y^2 - 2x - 6y + 6z = 0$

I put the equation in the form $(x-1)^2 + (y-3)^2 + 6z = -10$... and I think this is also a cylinder... ?

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    You might consider accepting some of the answers posted to your other questions if you found them satisfying.2012-06-10

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