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Re: x,y and the rest of the band [#permalink]
21 Jun 2011, 00:15

Statement 1: if you substitute for 6/x for y you get 2 values for x which means there is no certain answer Statement 2: ditto. if you substitute 5-y for x you get (3-y)(2+y), which gives you, y = 3 of y = -2.

I had some trouble working it out and the whole post got messed up (I think I did something wrong using some math signs or something:S), I'll try to do it later.

Re: x,y and the rest of the band [#permalink]
21 Jun 2011, 00:15

The answer is E. (1) and (2) don't give single specific values for x and y. Combination of (1) and (2) gives a quadratic equation, which can give 2 values of x (or y), which in turn can result in two values of the expression that we're supposed to evaluate. Hence there is no single specific answer for the expression based on data given. _________________

Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)

From Statement 1 Insert x.y=6 into [eq 1], 6 - 12/x + 2x - 4 = 2x-10 insufficient

From Statement 2 x+y=5 y=5-x

Insert into [eq 1], x(5-x)-2(5-x)+2x-4 = 5x-x^2-10+2x+2x-4 = -x^2+9x-14 insufficient

Statement 1 + 2 x(5-x)=6 5x-x^2-6=0 (-x-2)(x-3)=0 x=3 or x =2 Insufficient

Answer: E

Quote:

The answer is E. (1) and (2) don't give single specific values for x and y. Combination of (1) and (2) gives a quadratic equation, which can give 2 values of x (or y), which in turn can result in two values of the expression that we're supposed to evaluate. Hence there is no single specific answer for the expression based on data given.

_________________

"The best day of your life is the one on which you decide your life is your own. No apologies or excuses. No one to lean on, rely on, or blame. The gift is yours - it is an amazing journey - and you alone are responsible for the quality of it. This is the day your life really begins." - Bob Moawab

gmatclubot

Re: x,y and the rest of the band
[#permalink]
05 Sep 2011, 08:22