2012 · Q33
If 3/(x+y) + 2/(x-y) = 2 and 9/(x+y) - 4/(x-y) = 1 then what is x/y equal to?
Elementary MathematicsAlgebra
- A3/2
- B5
- C2/3
- D1/5
Explanation
Putting u = 1/(x+y), v = 1/(x-y): u = 1/3, v = 1/2, so x+y = 3 and x-y = 2, giving x/y = 2.5/0.5 = 5.