Consider the phase portrait shown below for a system of the form dy dt = f(x, y), g(x, y), where f, g and all their partial derivatives are continuous functions. 3 2 1 -0 -1 -2 7 x 7 2 dx dt KR -3 -3KKKK ↑ -2 -1 0 x = 1 K 2 ✓ B 3 This system has two equilibrium points (red dots), one at (0, 1) and one at (0, -1). Two solution curves are shown (one black and one blue). (a) What type of equilibrium is at (0,1), e.g. nodal source, spiral sink, saddle, etc.? Explain your answer.

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