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If x y = 8, which of the following must be true? I. Both

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If x y = 8, which of the following must be true? I. Both [#permalink] New post 19 Dec 2004, 18:43
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10. If x – y = 8, which of the following must be true?

I. Both x and y are positive
II. If x is positive, y must be positive
III. If x is negative, y must be negative


0 I only
0 II only
0 III only
0 I and II
0 II and III

Unfortunately, I have no clue on how to solve this question.
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 [#permalink] New post 19 Dec 2004, 22:45
To solve this kind of problems. Take some numbers and play with answer choices. In this case 3 only as addition of negative and negative cant be positive
  [#permalink] 19 Dec 2004, 22:45
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If x y = 8, which of the following must be true? I. Both

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