Graphing Elliptic Cylinders

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Given a question to graph:

x^2 + 4y^2 = 16

I would assume its a 2D Plot. My textbook assumes otherwise and treats it as a trace.

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This is how the equation looks like when plotted.

x^2 + 4y^2 = 16

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My question is - is the 3D plot of x^2 + 4y^2 = 16 the same as the 2D plot of x^2 + 4y^2 = 16 except one is parallel to the plane and thats it? What distinguishes them? In the future if Im asked to draw a cylinder plane what would be the proper equation for it?

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1 Answer

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$x^2+4y^2 = 16$ is the same thing as saying that $x^2+4y^2+0z=16$. So $z$ will not affect your graph, but now you can graph this equation in $3$ dimensions.

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