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For questions 4, 5 and 6, suppose that the augmented matrix of a linear system has been reduced by elementary row operations to the given

For questions 4, 5 and 6, suppose that the augmented matrix of a linear system has been reduced by elementary row operations to the given matrix below. 1 6 10 11 -8 1 13 0 9 0 How many equations does the system have

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