Wanted to brush up on my diff equations a bit. I have kind of forgotten how to determine phase plane stability in systems of differential equations. 1. The problem statement, all variables and given/known data Solve linear systems. Determine whether the critical point (0,0) is stable, asymptotically stable, or unstable. dx/dt=2x and dy/dt=-2y 2. Relevant equations Not sure there's anything for this section... 3. The attempt at a solution Well 2x=0 and -2y=0 only yields a 1 CP of (0,0). Without using matlab or something, I'm really not sure how to do this numerically. Help anyone? Thank you much.