1.

Let a, b, x, y be real number such that a2 + b2 = 25, x2 + y2 = 169, and ax + by = 65. If k = ay - bx, then

A. k = 0
B. \(k = \frac{5}{13}\)
C. \(0< k \le \frac{5}{13}\)
D. \(k > \frac{5}{13}\)
Answer» B. \(k = \frac{5}{13}\)


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