Answer
It is a hyperbola.
See Graph I for the equation.
Work Step by Step
For $\frac{y^2}{9} - \frac{x^2}{9} = 1$,
it is a hyperbola with center at (0, 0) and y-intercepts at $\pm3$.
See Graph I for the equation.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.