I'm confused on what to do here

8. [-/0.12 Points] DETAILS SCALCET9 1 Use traces to sketch the surface. (If an answer does not exist, enter DNE. Select Update Graph to see your response plotted on t y = 722- 7x2 (Write an equation for the cross section at z = -1 using x and y.) (Write an equation for the cross section at z = 0 using x and y.) (Write an equation for the cross section at z = 1 using x and y.) (Write an equation for the cross section at y = -1 using x and z.) (Write an equation for the cross section at y = 0 using x and z.) (Write an equation for the cross section at y = 1 using x and z.) (Write an equation for the cross section at x = -1 using y and z.) (Write an equation for the cross section at x = 0 using y and z.) (Write an equation for the cross section at x = 1 using y and z.) Update Student Response Response Description Graph Enter appropriate values in the answer blank(s) and click "Update Graph." -0.5 05 0.5 Identify the surface. hyperbolic paraboloid elliptic cylinder hyperboloid of one sheet hyperboloid of two sheets elliptic cone ellipsoid elliptic paraboloid parabolic cylinder