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posted by winston on Friday, December 31, 2010 at 6:31pm.

If x2+xy=10, then when x=2, dy/dx=?

2x dx + x dy + y dx = 0 x dy = -(2x+y) dy dy/dx = - x/(2x+y) when x = 2, y = (10-x^2)/x = 3 so -2/(4+3) = -2/7

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