Hệ phương trình x^2 - 2xy + 3y^2 = 9; 2x^2 - 13xy + 15y^2 = 0 có nghiệm là?

A. (3; 1); (−3; −1)

B. $\left(\frac{5\sqrt{2}}{2};\frac{\sqrt{2}}{2}\right)$; $\left(-\frac{5\sqrt{2}}{2};-\frac{\sqrt{2}}{2}\right)$

C. (3; 1); (−3; −1); $\left(\frac{5\sqrt{2}}{2};\frac{\sqrt{2}}{2}\right)$; $\left(-\frac{5\sqrt{2}}{2};-\frac{\sqrt{2}}{2}\right)$

D. (3; -1); (3; −1); $\left(\frac{5\sqrt{2}}{2};\frac{\sqrt{2}}{2}\right)$; $\left(-\frac{5\sqrt{2}}{2};-\frac{\sqrt{2}}{2}\right)$