Chapter 12.6, Problem 4PT

The graph at the right has equation:

1. a) $x=\frac{y^2}{b^2}+\frac{z^2}{c^2}$
2. b) $y=\frac{x^2}{a^2}+\frac{z^2}{c^2}$
3. c) $z=\frac{x^2}{a^2}+\frac{y^2}{b^2}$
4. d) $y^2=\frac{x^2}{a^2}+\frac{z^2}{c^2}$