Question: Each of the given linear systems is in row echelon form. Solve the system. (a) x + y - z + 2w = 4 w

Each of the given linear systems is in row echelon form. Solve the system.
(a) x + y - z + 2w = 4
w = 5
(b) x - y + z = 0
y + 2z = 0
z = 1

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