Use Cramer's rule to solve the system. 9x + 7z = 117-4x + 9y + 9z = 84 6x - 7y = 15
A. {(6, 3, 9)}
B. {(7, 1, 9)}
C. {(3, 9, 3)}
D. {(6, -3, -9)}
Answer: A
Mathematics
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