Solve the system of equations.
A. x = 2, y = -1, z = 9; (2, -1, 9)
B. x = 2, y = -1, z = -9; (2, -1, -9)
C. x = -2, y = -1, z = 9; (-2, -1, 9)
D. x = -2, y = -1, z = -9; (-2, -1, -9)
Answer: C
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