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Old 07-30-2007   #3
bubbly_27
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the answer is x+y=2y=f(x)=1/x^2slope =dy/dx=f'(x)=-1/x^3slope at (1,1)=-1/1^3=-1eqn of line witha slope of -1 and passing through (1,1) is y-1=-1(x-1)y-1=-x+1 =>x+y=2.