Use Cramer’s rule to solve for the unknown variables in each of the following 3 × 3 systems of simultaneous equations.

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(b) 2a. Multiplying row 2 by - to obtain 1 in the a22 position, [ 1 8 0 ] 11 8 2b. Subtracting times row 2 from row 1 to clear column 2, [] 1 With the identity matrix now on the left-hand side of the bar, T A-1 = 11 - 8 11 x = - 14 X = 24 Multiplying the two matrices using simple row-column operations, -(14)+(24) 11 X = = (14)-(24) 66 --[4] 11 Compare the answers here with those of Problem 6.3 (a).