Solving Linear Systems with Substitution - Definition & Examples

Solve the system of equations using substitution. $$\begin{gather} 8x-y-2z=27\\ -x+2y+9z=16\\ 2x-4y-2z=0 \end{gather}$$ If the solution is $(x,y,z)$, enter in the value of $100x + 10y+z$ as your answer.