3. Consider the following system of linear equations: x+ 2y – z = -1 2.x + 2y + z = 1 3x + 5y – 2z = -1 a.Use Gaussian elimination to find the solution of the system b. Find a basis for the solution set of the following system: Xi + x2 – 3x3 + x4 = 0 xi + x2 + 13 – X4 = 0 Lị + 22 – 23 = 0

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