Write the system of linear equations represented by the augmented matrix. Then use back-substitution to solve. (Use variables x, y, and z.) 
A) x = 2, y = 3, z = 1
B) x = -1, y = -2, z = 3
C) x = -1, y = 2, z = -3
D) x = 83, y = -5, z = -4
E) x = -2, y = -1, z = 3
Correct Answer:
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