If (x/a) + (y/b) = 3 and (x/b) – (y/a) = 9, then what is the value of x/y?

• ( b + 3 a)/( a – 3 b)
• ( a + 3 b)/( b – 3 a)
• (1 + 3 a)/( a + 3 b)
• ( a + 3 b2)/( b – 3 a2)