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Which following equation has exact one point with x and y is

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Which following equation has exact one point with x and y is [#permalink] New post 18 Aug 2006, 07:32
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Which following equation has exact one point with x and y is integers?

y=2x
y=2x/5
y=x+1/2
y=x*root3
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 [#permalink] New post 18 Aug 2006, 07:58
I am not sure I understand the question exactly but here goes ...

For A. y = 2x you have multiple values of integers x = 1,2,3,4...
For B. y= 2x/5 we have multiple values of integers x = 10,15,20..
For C. y=x + 1/2 has integers x & y.
For D. y = x sqrt(3) only one point (0,0) has an integer value.

Therefore Answer: D.
  [#permalink] 18 Aug 2006, 07:58
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Which following equation has exact one point with x and y is

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