**Learning objectives**

- Work with a system of differential equations to model populations of two interacting species
- Explain and interpret the phase plane for a 2-dimensional system
- Connect information from the phase plane with information about plots of solutions

**Before class**

- Read Hughes-Hallett 10.6.
- Ponder problems 10.6.2,4,5,6,8,12,20.
- Consult the main points of the lesson

**In class**

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