If x/y = 2/7, then (x + y)/(x - y) = ?
Choose the correct choice from the following choices.
A) 5 B) 1 / 5 C) - 1 / 6 D) - 9 / 5 E) - 5

Rationale: "any x and y satisfying x / y = 2 / 7 should give the same value for ( x + y ) / ( x - y ) . say x = 2 and y = 7 , then ( x + y ) / ( x - y ) = ( 2 + 7 ) / ( 2 - 7 ) = - 9 / 5 . answer : d ."
Answer: D