Write the System of Equations Represented by the Augmented Matrix $\left[ \begin{array} { c c c | c } 1 & - 2 & 1 & - 12 \\0 & 1 & 2 & 8 \\0 & 0 & 1 & 4\end{array} \right]$

question 159

Essay

Write the system of equations represented by the augmented matrix. $\left[ \begin{array} { c c c | c } 1 & - 2 & 1 & - 12 \\0 & 1 & 2 & 8 \\0 & 0 & 1 & 4\end{array} \right]$ __________ Use back substitution to find the solution. __________

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