4. Consider the system (a) (b) x1+x22x3 + 4x4 = 0 -2x1 - x2+4x35x4 = 0 = 0. 4x1 + x2 - 8x3 + 7x4 Without solving the system, show that it cannot have a unique solution. Use Gauss-Jordan elimination to find all basic solutions of the system.

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