If xy not equal 0 and x^2*y^2 -xy = 20, which of the following could be y in terms of x?
I. 1/2x
II. -5/x
III. 4/x	Choose the correct choice from the following:	A) II	B) II and III	C) I &II	D) III	E) IV
x2y2 - xy = 20   x2y2-xy-20 = 0   (xy-4)(xy+5)=0   xy = 4 or xy=-5   y = 4/x or y = -5/x   II and III only   II and III
<result>B</result>
If xy not equal 0 and x^2*y^2 -xy = 20, which of the following could be y in terms of x?
I. 1/2x
II. -5/x
III. 4/x