Determine all pairs of integers (x,y) which satisfy the equation 6x2−3xy−13x+5y=−11
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Silverfalcon
28.01.2006 01:10
This is a very nice problem. My first idea was to see if this problem had no solution and prove it with mod but that didn't work out very nicely. So, I solved for y in terms of x.
After moving things around, I got y=6x2−13x+113x−5. Using Long Division, this becomes 2x−1+63x−5. For y to be an integer, we need to have 3x−5 as an integer divisior of 6. So, 3x−5=±1,±2,±3,±6. Solving for x, we only get 2 integer x values and plugging them gives y values as well. Those are (2,9),(1,−2)◼.
nbgb
04.11.2017 13:47
(-5 + 3 x) (-1 + 2 x - y)=-6 KARA trivial
nbgb
04.11.2017 14:24
{(-5 + 3 x) == -2, (-1 + 2 x - y) == 3} {(-5 + 3 x) == 1, (-1 + 2 x - y) == -6}