Write the System of Linear Equations Represented by the Augmented $\left[ \begin{array} { r r r | r } 1 & 5 & - 8 & 4 \\ 0 & 1 & - 6 & - 4 \\ 0 & 0 & 1 & - 7 \end{array} \right]$

question 78

Multiple Choice

Write the system of linear equations represented by the augmented matrix. Use x, y, z, and, if necessary, w for the variables. Then use back-substitution to find the solution.
- $\left[ \begin{array} { r r r | r } 1 & 5 & - 8 & 4 \\ 0 & 1 & - 6 & - 4 \\ 0 & 0 & 1 & - 7 \end{array} \right]$

• A) \(\{ ( 178 , - 46 , - 7 ) \}\)
• B) \(\{ ( 4 , - 4 , - 7 ) \}\)
• C) \(\{ ( 6,1 , - 8 ) \}\)
• D) \(\{ ( 250,38 , - 7 ) \}\)

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