Solve the system using the elimination method or a combination of the elimination and substitution methods.5x2 + 3xy - 5y2 = -9x2 - xy - y2 = -5
A. 
B. {(-1, 2), (1, -2), (2i, i), (-2i, -i)}
C. {(-1, -2), (1, 2), (2i, -i), (-2i, i)}
D. 
Answer: C
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