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posted by theo on Sunday, July 4, 2010 at 6:06pm.
Calculate dy/dt using the given information. xy + x = 12; dx/dt = -3, x = 2, y = 5?
x y + x = 12 x dy/dt + y dx/dt + dx/dt = 0 2 dy/dt + 5(-3) - 3 = 0 I guess you can take it from there.
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