Linear AlgebraEasyRow Reduction & Rank

Row Reduction & Rank · Easy problem

The augmented matrix of a system in unknowns $x, y, z$ has reduced row echelon form

\left(\begin{array}{ccc|c} 1 & 0 & 2 & 3 \\ 0 & 1 & -1 & 4 \end{array}\right).

The variable $z$ is free. Find $x$ in the solution with $z = 1$ .