Solve each of the following by Cramer's rule: (a) 3x + 4y = 9 2x - y

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Solve each of the following by Cramer's rule:
(a) 3x + 4y = 9
2x - y = -1
(b) 4x - y + 3z = 1
6x + 2y - z = 0
3x + 3y + 2z = -1
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