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Seventeen divides expression? (Posted on 2015-04-26) Difficulty: 3 of 5
x, y are integers, and 17 divides both the expressions x2-2xy+y2-5x+7y and x2-3xy+2y2+x-y.

Does 17 always divide xy-12x+15y, for every choice of x and y?

If not, give an example.
If so, prove it.

No Solution Yet Submitted by K Sengupta    
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Hints/Tips re: solution...................a typo Comment 3 of 3 |
(In reply to solution by Daniel)

Your xy-12+15y  should read  xy-12x+15y

Please edit.

  Posted by Ady TZIDON on 2015-04-28 21:27:12
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