Write the System of Linear Equations Represented by the Augmented $$\left[ \begin{array} { r r r r r } 1 & 9 & - 3 & \vdots&- 39 \\0 & 1 & 2 & \vdots & 0 \\0 & 0 & 1 & \vdots & 2\end{array} \right]$$

question 167

Multiple Choice

Write the system of linear equations represented by the augmented matrix.Then use back-substitution to solve.(Use variables x, y, and z.) $$\left[ \begin{array} { r r r r r } 1 & 9 & - 3 & \vdots&- 39 \\0 & 1 & 2 & \vdots & 0 \\0 & 0 & 1 & \vdots & 2\end{array} \right]$$

• A)x = 4, y = 2, z = -3
• B)x = 3, y = -4, z = 2
• C)x = 3, y = 4, z = -2
• D)x = -18, y = -1, z = 4
• E)x = -4, y = 3, z = 2

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