Answer
Hyperboloid of one sheet (graph j).
Work Step by Step
The equation is a graph for a Hyperboloid of one sheet along the y-axis as shown in graph (j).
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.