Solve y′+3y=0y' + 3y = 0y′+3y=0.
y=Ce−3xy = C e^{-3x}y=Ce−3x
y=Ce3xy = C e^{3x}y=Ce3x
y=−3x+Cy = -3x + Cy=−3x+C
y=3/xy = 3/xy=3/x