990 CHAPTER 9 Systems and Matrices 27. Concept Check Which of the following properties does not apply to multiplication of matrices? A. commutative B. associative C. distributive D. identity Find the inverse, if it exists, for each matrix. 28. c -8 3 5 -2d 29. c 4 2 12 6d 30. £ 1 2 -2 3 7 -5 4 8 -7§ Solve each system using the inverse of the coefficient matrix. 31. 2x + y = -6 3x - y = -29 32. x + y = 5 y - 2z = 23 x + 3z = -27
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