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**first order system DE --> second order**

## Homework Statement

Find a second-order DE for x alone that is equivalent to this system.

## Homework Equations

dx/dt = 2x-y

dy/dt = -x

## The Attempt at a Solution

I honestly have no clue where to start; in class we pretty much only stuck to springs when discussing second order equations.

Do I have to integrate the two given equations with respect to t so I have the t's in the equation? Or should I differentiate so I have a second derivative and hence a second order equation?