For the differential equation $y^{\text{'}\text{'}}-y^{\text{'}}-6y=0,$ a general solution is of the form $y=C_1{e}^{-2x}+C_2{e}^{3x},$ where $C_1$ and

$C_2$ are arbitrary constants.

Applying the initial conditions $y(0)=3$ and $y^{\text{'}}(0)=-1,$ find the specific solution.

$y=$