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- Thread starter dwsmith
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$$\dot{y} = b -ay-x^2y$$

Ok I found an example

http://demonstrations.wolfram.com/PhasePlanePlotOfTheVanDerPolDifferentialEquation/#

The left graph where it plots x (t) vs x' (t) with parametric plot.

How can I do this with my ODEs?

http://demonstrations.wolfram.com/VanDerPolOscillator/

Here is another example plot