Use the elimination method to find a general solution for the given linear system, where differentiation is with respect to $t.$

$x^{\text{'}}=2x-y$

$y^{\text{'}}=2y-x$

Now find $x(t)$ so that $x(t)$ and the solution for $y(t)$ found in the previous step are a general solution to the system of differential equations. Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

A$.x(t)=$

B$.$ The system is degenerate.