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6. Use the method of row operations to solve the following system of linear equations: 93: + y + 112; = 29 (1) a: 2y 32 = 1 (2) 73: 6y 5z = 9 (3) 7. Consider the following system of linear equations a: + 2g + 3z = 1 (1) 3:3 + kg z k 3 (2) 2x + 53; + z = 3 (3) For what values of It will the system (a) have a unique solution? (b) have no solution? (c) have infinitely many solutions? For (a) and (c), find also the solution(s) to the system