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**tony123****Member**- Registered: 2007-08-03
- Posts: 189

find all real x,y such that

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**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,751

I can think of only one solution right away.

(0,0)

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**JaneFairfax****Member**- Registered: 2007-02-23
- Posts: 6,868

If you multiply the LHS of the first equation by

, it becomes . HenceBecause the equations are symmetrical in *x* and *y*, you know that the answer must be in the form *x* = *y*. Therefore

(*x*=1 is rejected; it came into the working because I multiplied both sides of the first equation by

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