Solve the System $\left(\begin{array}{rl}4 x+3 y-4 z & =-15 \\3 x-3 y+4 z & =43 \\5 y+z & =-21\end{array}\right)$

Short Answer

Solve the system. $\left(\begin{array}{rl}4 x+3 y-4 z & =-15 \\3 x-3 y+4 z & =43 \\5 y+z & =-21\end{array}\right)$