In Exercises 9-12, write the system of linear equations represented by the augmented matrix. Use x, y, and z, or, if necessary, w, x, y, and z, for the variables.
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Identify the augmented matrix: .
Recognize that each row of the matrix corresponds to a linear equation.
Assign variables to the columns: let the first column be , the second column be , and the third column be .
Write the first equation from the first row: .
Write the second equation from the second row: .
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