Posted by **Tiffany** on Monday, October 6, 2008 at 12:42pm.

Find all points on the curve x^2y^2+2xy=3 where the slope of the tangent is -1. If there is more than one point, use a comma to separate each pair of coordinates

- Calculus -
**David Q**, Monday, October 6, 2008 at 2:53pm
Do you mean the curve x^2 + y^2 + 2xy = 3?

- Calculus -
**David Q**, Monday, October 6, 2008 at 3:12pm
On second thoughts, I don't think you do mean that: if you did, the tangent would be -1 for every point on the curve.

If it IS x²y² + 2xy = 3, then put z=xy for a moment, in which case z²+2z=3, in which case z=1 or z=-3. So xy=1 or xy=-3, i.e. y=1/x or y=-3/x. If you differentiate each with respect to x and solve for dy/dx = -1, you should get the answers you need.

- Calculus -
**I am a**, Tuesday, November 1, 2011 at 2:31pm
Big juicy pickle

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