Algebra 2HardSystems of Equations

Systems of Equations · Hard problem

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

\begin{cases} - 2 x + 4 y - 5 z = -42 \\ - 5 x + 2 y + 5 z = -30 \\ - 5 x - 4 y - 4 z = -18 \end{cases}