For Problems: (a) Determine all equilibrium solutions. (b) Determine the regions in...

For Problems:

(a) Determine all equilibrium solutions.

(b) Determine the regions in the xy-plane where the solutions are increasing, and determine those regions where they are decreasing.

(c) Determine the regions in the xy-plane where the solution curves are concave up, and determine those regions where they are concave down.

(d) Sketch representative solution curves in each region of the xy-plane identified in (c).