In Exercises 25–28, the first screen shows the augmented matrix, A, for a non square linear system of three equations in four variables, w, x, y, and z. The second screen shows the reduced row-echelon form of matrix A. For each exercise,

a. Write the system represented by A.

b. Use the reduced row-echelon form of A to find the system’s complete solution.

[A] [1 1 1 2 5 5 -31 3 4 -1 1 1 2 3] 1 rref ([A]) 11 1 0 1 3 0 1 2 1 -2 0 0 0 0 0