Answer Happy

3. Classify (if possible) each critical point of the given plane autonomous system as a stable node, an unstable node, a stable spiral point, an unstable spiral point or a saddle point. (a) x = x³ - y y = x - y³ (b) x = y - x² + 2 y = 2xy - y (c) x = x (10- x - y) y = y(16- y - x)