Write the System of Linear Equations Represented by the Augmented $\left[\begin{array}{rrrrrr}1 & 2 & 5 & \vdots & 34 \\0 & 1 & 2 & \vdots & 14 \\0 & 0 & 1 & \vdots & 5\end{array}\right]$

question 65

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. ) $\left[\begin{array}{rrrrrr}1 & 2 & 5 & \vdots & 34 \\0 & 1 & 2 & \vdots & 14 \\0 & 0 & 1 & \vdots & 5\end{array}\right]$

• A)x = 35,y = -3,z = 1
• B)x = 4,y = 1,z = 5
• C)x = 1,y = -4,z = -5
• D)x = 1,y = 4,z = 5
• E)x = -4,y = 5,z = -1

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