Solve the system by the addition method.2x2 + y2 = 173x2 - 2y2 = -6
A. {(1, 3), (-1, -3)}
B. {(2, -3), (-2, 3)}
C. {(2, 3), (2, -3), (-2, 3), (-2, -3)}
D. {(1, 3), (1, -3), (-1, 3), (-1, -3)}
Answer: C
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