How do we draw an ellipse ? If b was bigger than a and how to get vertices and covertices and where are they located

The level curve that is defined by z 2 at, y) = 4332 l y2 lies in the function's domain, that is, it is the set of points (x, y) that satisfies the equation 4:02 + y2 = k, where k: is constant. In this case, level curves are ellipses in any-axes centered at the origin. Hence, level curves for k: = 0,4,16, are shown below