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The unknown function $x(t)$ in the system of differential equation:

$$\begin{align}x\prime(t)&=4y(t) \\\ \\\ y\prime(t)&=-x(t)+y(t) \end{align}$$

...satisfies the second order differential equation:

$x''(t)+x'(t)-4x(t)=0$

$x''(t)-\cfrac{1}{4}x'(t)+4x(t)=0$

$x''(t)-x(t)+4x(t)=0$

None of the above