Solve the system by the substitution method.xy = 27x2 + y2 = 90
A. {(3, 9), (-3, -9), (9, 3), (-9, -3)}
B. {(3, 9), (-3, -9), (3, -9), (-3, 9)}
C. {(-3, -9), (-9, -3), (-3, 9), (-9, 3)}
D. {(3, 9), (9, 3), (3, -9), (9, -3)}
Answer: A
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