## University Calculus: Early Transcendentals (3rd Edition)

a. Domain : The domain is set of all $(x,y)$ in the xy -plane. b. Range: A set of all Real numbers c. Level Curves: These are Hyperbolas with the x- axis and y-axis as asymptotes when $f(x,y) \ne 0$ also, the x-axis and y-axis hen $f(x,y)=0$ d. No boundary points e. Both closed and open. f. Unbounded