4. Use an augmented matrix and row operations to find the values of a and b for which the following system has a) a unique solution, b) no solution, and c) infinitely many solutions and find this solution set. d) Find the solution set if a =2 and b= -2. 3x1 + 4x2 + 2x3 = 5 X1 - 2x2 + 4x3 2x1 - x2 + ax3 = b = 5

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