Solve the system of equations (only real solutions) by the elimination method. Check your solutions.
A. {(4, 9), (-4, 9), (4, -9), (-4, -9)}
B. {(4, 9), (9, 4), (-4, -9), (-9, -4)}
C. {(-4, -9), (-9, -4)}
D. {(4, -9), (4, 9)}
Answer: A
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