Chapter 4.9, Problem 21E

In Problems 21 and 22 solve the given initial-value problem.

21. $\begin{array}{l}\frac{dx}{dt}=-5x-y\hfill \\ \frac{dy}{dt}=4x-y\hfill \\ x(1)=0,y(1)=1\hfill \end{array}$