Solve the following system by any appropriate method. If there is no real number solution, so state.x2 + y2 = 81y = x - 9

A. (9, 0), (0, -9)
B. (-9, 0), (9, 0), (0, -9), (0, 9)
C. (-9, 0), (0, 9)
D. no real solution

Answer: A

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