If x+y=3 and x2y3 + y2x3=27, what is the value of xy? Choose the correct option:
A) 1 B) 2 C) 3 D) 4 E) 5
xy=3   As x+y=3   x2y3+y2x3=27   x2y2(y+x)=27   Substituting x+y   x2y2=9   xy=3   ANSWER:3
<result>C</result>
If x+y=3 and x2y3 + y2x3=27, what is the value of xy?