In 19 through 28, investigate the type of the critical point (0, 0) of the given almost

Chapter 7, Problem 7.3.22

(choose chapter or problem)

In 19 through 28, investigate the type of the critical point (0, 0) of the given almost linear system. Verify your conclusion by using a computer system or graphing calculator to construct a phase portrait. Also, describe the approximate locations and apparent types of any other critical points that are visible in your figure. Feel free to investigate these additional critical points; you can use the computational methods discussed in the application material for this section. dx 22. - =x+4y -xy2, dy - = 2x _y +x2y dt

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