Solve.x2 + y2 - 2xy = 64x2 + y2 + 2xy = 225
A. (-3.5, 11.5), (-3.5, -11.5)
B. (23, -7),(-23, -7), (-7, 23), (7, 23)
C. (11.5, 3.5), (3.5, 11.5)
D. (11.5, -3.5), (-11.5, -3.5), (-3.5, 11.5), (3.5, 11.5)
Answer: C
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