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## Homework Statement

Plot the phase plane of: y(t) = e

^{-6t}(2 1) + e

^{-3t}(1 -1)

## Homework Equations

## The Attempt at a Solution

I know it's a sink because [tex]\lambda_2 < \lambda_1 < 0[/tex].

http://img35.imageshack.us/img35/8108/sink.th.jpg [Broken]

but the phase plane in the answer is slanted to the right. Does anyone know why?

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