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    I really dont know how you derive a differential equation from a paragraph of writing of rates of change. I just dont understand it.

    I can solve the differential equation, but i dont know how to derive it from text. Please could someone tell me what I should look for and how to do it, please!!!
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    (Original post by BlueAngel)
    I really dont know how you derive a differential equation from a paragraph of writing of rates of change. I just dont understand it.

    I can solve the differential equation, but i dont know how to derive it from text. Please could someone tell me what I should look for and how to do it, please!!!
    put all the y on one side and all the x on the other side integrate both side, find c!
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    (Original post by tammypotato)
    put all the y on one side and all the x on the other side integrate both side, find c!
    no, she doesn't know how to write a differential equation, when given a load of text :rolleyes:
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    (Original post by BlueAngel)
    I really dont know how you derive a differential equation from a paragraph of writing of rates of change. I just dont understand it.

    I can solve the differential equation, but i dont know how to derive it from text. Please could someone tell me what I should look for and how to do it, please!!!
    look for something like "the rate of change of ..... is proportional to ....."

    e.g. Water leaks out of a tank. the rate of decrease in V (volume) is proportional to V. write a differential equation:

    dV/dt proportional to V
    dV/dt = -kt (- since it is decreasing)
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    (Original post by mockel)
    look for something like "the rate of change of ..... is proportional to ....."

    e.g. Water leaks out of a tank. the rate of decrease in V (volume) is proportional to V. write a differential equation:

    dV/dt proportional to V
    dV/dt = -kt (- since it is decreasing)


    Thank you very much, you get rep.
 
 
 
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