Solve.x2 + y2 - 2xy = 100x2 + y2 + 2xy = 225
A. (12.5, 2.5), (2.5, 12.5)
B. (25, -5),(-25, -5), (-5, 25), (5, 25)
C. (-2.5, 12.5), (-2.5, -12.5)
D. (12.5, -2.5), (-12.5, -2.5), (-2.5, 12.5), (2.5, 12.5)
Answer: A
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