Draw the phase diagra of the system; list all the equilibrium points; determine the stability of the equilibrium points; and describe the outcome of the system from various initial points. You should consider all four quadrants of the xy-plane.(For full marks, all the following must be included, correct and clearly annotated in your phase diagram:The coordinate axes; all the isoclines; all the equilibrium points; the allowed directions of motion (both vertical and horizontal) in all the regions into which the isoclines divide the xy plane; direction of motion along isoclines, where applicable; examples of allowed trajectories in all regions and examples of trajectories crossing from a region to another, whenever such a crossing is possible. Draw out the phase diagram
(dx)/(dt)=(x-y)(x+y),(dy)/(dt)=-y
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