That will be an ellipse on the plane x = 0. Do you see that it is a 2D curve since there are only 2 variables?
I am finding it hard to recognize the difference between paraboloids,cylinders,cones and etc..(any 3d surfac)
How do I tell the difference between them?
for example y^2+4z^2=9 where does this curve open up..how do i tell?
I know I am asking stupid questions ..