I need some help on this problem:

Prove that the projection into the xy plane of the intersection of the plane z = y and the paraboloid z = x^2 + y^2 is a circle

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- September 17th 2009, 08:42 PMmessianicHelp with Planes and Paraboloids
I need some help on this problem:

Prove that the projection into the xy plane of the intersection of the plane z = y and the paraboloid z = x^2 + y^2 is a circle - September 17th 2009, 10:06 PMChris L T521