The solution of a system of linear equations in the variables z, y, z, and u using the Gauss-Jordan method is represented by the following augmented matrix: 100 17 0 10 9 0 0 1 18 000 0 1 -9 12 (a) Write the general solution for this system in terms of the variable u. (Hint: Your answer should give z, y and z in terms of u). (x, y, z, u) = | 15 0 = (b) Write the specific solution for this system as a 4-tuple when u = -1. (z, y, z, u) )

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