hi im new to the forum . i needed help on the following question. sorry if i posted this in the wrong area.

1. draw a level curve diagram (with atleast 3 contours) for the surface: $\displaystyle z^2$ = 9$\displaystyle x^2$ + 4$\displaystyle y^2$

2. sketch a graph of the surface: $\displaystyle z^2$ = 9$\displaystyle x^2$ + 4$\displaystyle y^2$

any help much appreciated