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Hard C4 Differential Equations (log + linear type) question help watch

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    So times like this I wish I had stopped being a proper noob and had chosen to continue on with further maths in y13...

    So basically I don’t get the answer on the mark scheme , because I am obviously totally missing the plot somwhere.

    I know the problem is with the constant of integration. But I don’t know what specifically.

    Any help would be much appreciated 😀
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    Here’s the question..
    Attached Images
     
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    @ me if want to see my working
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    (Original post by ManLik2)
    @ me if want to see my working
    Working plz and a pic of the markscheme
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    (Original post by ManLik2)
    Here’s the question..
    Show your attempt.

    We have \dfrac{-5}{y-75}.dy = 2 .dx which integrates into -5\ln |y-75| = 2x+c
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    Ok I’ve trying to upload my work but I keep getting error messages
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    I think I have figured it out but the mark scheme credits you for saying “Ax +b”, which looks like a bit of fms, so can someone explain this to me?

    I will try and upload my answers and ms ASAP
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    (Original post by RDKGames)
    Show your attempt.

    We have \dfrac{-5}{y-75}.dy = 2 .dx which integrates into -5\ln |y-75| = 2x+c
    Yep I uploaded it
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    No offense but I think its a good decision you dropped further maths, FP3 integration would have ****ed you in the arse
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    (Original post by ManLik2)
    Yep I uploaded it
    Don't see it.
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    (Original post by RDKGames)
    Don't see it.
    Click on the little boxes from my previous comments and open them
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    (Original post by floydd223)
    No offense but I think its a good decision you dropped further maths, FP3 integration would have ****ed you in the arse
    Haha I’m sure it would of
 
 
 
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Updated: March 5, 2018
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