1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

GRE Sample Question, explanation? Thanks!

  1. Mar 5, 2010 #1
    blu_ifxynot.gif

    The correct answer is (1/y) - (1/xy) but i don't understand why

    What does the sum of xy not equaling zero imply that we can do to the equation to solve it?
     
  2. jcsd
  3. Mar 5, 2010 #2

    Mark44

    Staff: Mentor

    If xy != 0, then neither x nor y = 0.

    Rewrite (x - 1)/(xy) as two separate fractions. What do you get?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: GRE Sample Question, explanation? Thanks!
Loading...