Posted by **Joy** on Tuesday, July 30, 2013 at 1:18pm.

15. The augmented matrix A represents a system of three real-valued equations in three unknowns. Which of the answer choices would result from the usual first step of applying Gauss-Jordan elimination?

A = (1 4 2 3)

A = (2 9 13 18)

A = (3 10 8 15)

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