Date: Sat, 13 Jan 2001 10:33:02 +0100 (MET)
From: Ivan Sovic
If you want a integer solutions, look at this:
1 1 1 --+--=--- /*7xy x y 7 7y+7x=xy 7y+7x-xy=0 y(7-x)+7x=0 y(x-7)=7x 7x y=---- x-7 7x-49+49 y=---------- x-7 49 y=7+ ------- x-7 49 y is integer if ----- is integer. x-7 That is integer if x= -42, 0, 6, 8, 14 or 56. 1 1 It can't be 0, because then ---=--- y 0 is imposible.
Solutions are (56,8), (14,14), (8,56), (-42,6), (6,-42).
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