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If e y + xy = e, the ordered pair ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ , dx y d , dx dy 2 2 at x = 0 is equal to :

1. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − 2 e 1 , e 1
2. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − 2 e 1 , e 1
3. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 2 e 1 , e 1
4. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − − 2 e 1 , e 1

Correct answer: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − 2 e 1 , e 1

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