Algebra 2HardSystems of Equations

Systems of Equations · Hard problem

Solve the system for $x$ , $y$ and $z$ .

\begin{cases} - 5 x - 2 y + 5 z = 27 \\ 3 x + y - 4 z = -21 \\ 5 x + 4 y + 4 z = 15 \end{cases}