I need to find the equation of the line tangent to the graph of 2x^2 +2xy-y^2=2 at the point (1,2)?
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Originally Posted by chaddy I need to find the equation of the line tangent to the graph of at the point (1,2)? Use implicite derivation: Solve the last equation for y': Now plug in the coordinates of the tangent point to calculate the slope of the tangent: Use the point-slope-formula to calculate the equation of the tangent line:
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