Question: In Problems 1922, reduce the given system to echelon form to find a single solution vector u such that the solution space is the set

In Problems 19–22, reduce the given system to echelon form to find a single solution vector u such that the solution space is the set of all scalar multiples of u.

x1 + 5x2 + x3 - 8x4 = 0 2x1 + 5x2

x1 + 5x2 + x3 - 8x4 = 0 2x1 + 5x2 - 5x4 = 0 2x17x2 + x39x4 = 0

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