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15 29 2 34 24 -33 21 27 The matrix M = is referred to in some of the problems below. 56 47 13 15 42 28 -11 56 1. The matrix M is the augmented matrix for a linear system. Give the (2,3) entry in the coefficient matrix for the system. 2. The matrix M is the augmented matrix for a linear system. Give the number of equations in the system. 3. The matrix M is the augmented matrix for a linear system. Give the number of unknowns in the system. 4. Apply the elementary row operation -2R, + R3 -> R, to the matrix M. What is the (3,3) entry in the resulting matrix? 5. Apply the elementary row operation R, R, to the matrix M. What is the (3,4) entry in the resulting matrix? 6. Apply the elementary row operation -2R, -> R, to the matrix M. What is the (3,4) entry in the resulting matrix