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Find the equation to the ellipse, whose ...

Find the equation to the ellipse, whose focus is the point `(-1,1),`whose directrix is the straight line `x-y +3=0,` and whose eccentricity is `1/2.`

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The correct Answer is:
`7(x^(2)+y^(2))+2xy+10(x-y)+7=0`
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