Section 9.3

  1. 1. Linearization at (0, 0): x=200x, y=150y; phase plane portrait:

  2. 3. Linearization at (75, 50): u=300v, v=100u; phase plane portrait:

  3. 5. The characteristic equation is λ2+45λ+126=0.

  4. 7. The characteristic equation is (24λ)22·(18)2=0. Phase plane portrait:

    Phase plane portrait for the nonlinear system in Problems 4-7:

  5. 9. The ...

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