The Solution to the Differential Equation $\frac { d y } { d x } = - 3 y$

Multiple Choice

The solution to the differential equation $\frac { d y } { d x } = - 3 y$ satisfying the boundary condition y = 3 when x = 0 is

A) $y = e ^ { 3 x } + 3$
B) $y = e ^ { - 3 x } + 3$
C) $y = 3 e ^ { 3 x }$
D) $y = - 3 e ^ { - 3 x }$
E) $y = 3 e ^ { - 3 x }$