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    https://gyazo.com/af16e4e881be68e021253fd8cd7a6310

    I don't understand the line where x turns into y and RHS changes into something weird.

    This is from Edexcel FP3 co-ordinate systems.
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    (Original post by Louisb19)
    https://gyazo.com/af16e4e881be68e021253fd8cd7a6310

    I don't understand the line where x turns into y and RHS changes into something weird.

    This is from Edexcel FP3 co-ordinate systems.
    They are simply substituting the expression for x into the expression for y given by the eqn of the normal at P, then rearranging.
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    (Original post by atsruser)
    They are simply substituting the expression for x into the expression for y given by the eqn of the normal at P, then rearranging.
    Thanks I didn't see that.
 
 
 
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