In this paper we generalize Bownds' Theorems (1) to the systems dY(t)/dt=A(t) Y(t) and dX(t)/dt=A(t) X(t)+F(t,X(t)). Moreover we also show that there always exists a solution X(t) of dX/dt=A(t)X+B(t) for which (The equation is abbreviated) if there exists a solution Y(t) for which (The equation is abbreviated).