Help with this Non-Linear Dynamics ( part 1 and part2)

Part 1: Use the following system x = -Axy, y = Axy - By A: Find the fixed points as a function of positive constant A and B. B: Define the x-nullcline (when x = 0) using a simple equation/inequality. For positive values of x and y, describe when x > 0 and x 0 and y B/A. Describe the behavior of the system and how it would change if B decreases