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A linear second order single input continuous time system is described by the following set of differential equations

$$ \begin{aligned} &x_1(t)=-2 x_1(t)+4 x_2(t) \\ &x_2(t)=2 x_1(t)-x_2(t)+u(t) \end{aligned} $$

Where $x_1(t)$ and $x_2(t)$ are the state variables and $u(t)$ is the control variable. The system is:

- controllable and stable
- controllable but unstable
- uncontrollable and unstable
- uncontrollable and stable