**Equation: **

**The trace in either the xz-plane or the yz-plane is
a parabola. The trace in a plane parallel to the xy-plane and "above"
the xy-plane is an ellipse.**

**Ignore the labels on the axes. The vertical axis
is the z-axis. Of the other two axes, the x-axis ranges from -10
to 10 and the y-axis ranges from -20 to 20.**