MathAlgebraLinear algebraSystems of linear equations

Row echelon form

Find out the missing elements

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The matrix below is in reduced row echelon form. Find out the sum of the missing elements. If it is impossible to unambiguously determine it, write down « $-1$ ».

$\begin{pmatrix} ? & ? & ? & 0 & 2 & 0\\ 0 & 1 & ? & 0 & 4 & ?\\ 0 & 0 & 1 & 0 & 5 & ?\\ 0 & 0 & 0 & ? & 8 & 0\\ 0 & 0 & 0 & ? & ? & 1\\ \end{pmatrix}$

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