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Math Help - Find the equation of the tangent line(s) to the graph

  1. #1
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    Find the equation of the tangent line(s) to the graph

    y^2-xy+3=0 at x= -4

    Can you please show me how I would get my answer? Thank you everyone!
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  2. #2
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    Re: Find the equation of the tangent line(s) to the graph

    Quote Originally Posted by schutzk21 View Post
    y^2-xy+3=0 at x= -4

    Can you please show me how I would get my answer? Thank you everyone!
    Hint:

    Implicit derivative :

    y'_{x,y}=\frac{y}{2y-x}

    Equation of the tangent line :

    y=y'_{x,y} \cdot x + b
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