The level curves are the set of points $(x, y)$ in the plane that makes the equation $f(x, y) = c$ true. In this case, our function is $f(x, y) = x^{2} - 2y$ and we are given the values of $c$ as $-4, -1, 0, 1, 4$. So, we have the following equations for the level
Show more…