1.

Q: If 12x – 15 y =9x + 5y, the value of $$ {x^{2}+{y^{2}}\over{x^{2}-y^{2}}}$$ is

A. $$ {23\over 17}$$
B. $$ {391\over 409}$$
C. $$ {400\over 9}$$
D. $$ {409\over 391}$$
Answer» E.


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