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Math Help - Find the equation of the tangent line

  1. #1
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    Find the equation of the tangent line

    Find the equation of the tangent line to x + y = 24 at the point (2,4).

    I need some help getting starting and any other useful tips.
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  2. #2
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    Quote Originally Posted by Johnny Walker Black View Post
    Find the equation of the tangent line to x + y = 24 at the point (2,4).

    I need some help getting starting and any other useful tips.
    Well, you have x=2 ; y=4 .
    You need to find the slope of the line at the point, that is f'(2).
    Then you can use what you know from algebra and set your line equation.
    Remember that f'(2), will be your m in the line equation.
    EDIT: Oh, and don't forget that you need to use implicit differentiation to find f'(x)
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