eq1:diff(x(t),t)=(-1/5)*x(t)+(2/5)*y(t);

eq2:'diff(y(t),t)=(1/5)*x(t)-(2/5)*y(t);

atvalue(x(t),t=0,15)$

atvalue(y(t), t=0, 0)$

desolve([eq1,eq2],[x(t),y(t)]);