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if (x-5)(y+2) = 0, which of the following must be true?

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if (x-5)(y+2) = 0, which of the following must be true?  [#permalink] New post 17 Jan 2004, 22:05
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if (x-5)(y+2) = 0, which of the following must be true?

a. x=y
b. x>y
c. x<y
d. xy=-10
e. none of the above
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 [#permalink] New post 17 Jan 2004, 23:08
B? X>Y if x=5 or if y= -2 the euation will be 0 so x has to be greater than y
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 [#permalink] New post 17 Jan 2004, 23:31
E?

(x-5)(y+2) = 0

if x = 5, y can be anything and it will be zero
if y = -2, x can be anything and it will be zero
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 [#permalink] New post 19 Jan 2004, 19:17
I agree with calnhob's answer and approach. In questions like these, I never go for the obvious which is setting x = 5 and y = -2. There's always a trick, unless it's the first question in the test.

My approach. First, identify what they are testing you. In an equation like this when is it equal to 0. When either set of ( ) is equal to 0 or when x=5 and y =-2. Then using that information, you move on.

I have learned through practice, never to dive into the question. First ask yourself, what is the GMAT testing, then write down either the formula or the rule. I'm not an expert in math, but it works for me.
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 [#permalink] New post 20 Jan 2004, 07:48
I also vote for E.

The calnhob way of thinking is the most appropriate here.
  [#permalink] 20 Jan 2004, 07:48
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