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July 3rd, 2009, 02:00 AM

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Quote:

Originally Posted by dhiab

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Solve In

:

If we rearrange the equation we find

$y = \frac{1000 - 19x}{13}$ .

You need to substitute an integer $x$ in order to get an integer $y$ .

For this to happen, $1000 - 19x$ needs to be a multiple of 13.

Have a go from here...

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