Solve the system by the addition method.x2 + y2 = 181x2 - y2 = 19
A. {(10, -9), (10, 9)}
B. {(-10, -9), (-9, -10)}
C. {(10, 9), (9, 10), (-10, -9), (-9, -10)}
D. {(10, 9), (-10, 9), (10, -9), (-10, -9)}
Answer: D
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