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Homework Help: Can someone please explain how to solve this IVP?

  1. Oct 22, 2015 #1
    • Missing homework template due to originally being posted in other forum
    x' =-5x-y
    y' =4x-y

    I got
    a=0 b=0

    The answer is
    I dont understand where the +3 comes from
  2. jcsd
  3. Oct 22, 2015 #2


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    Science Advisor
    Gold Member

    What are the initial conditions on x and y?
  4. Oct 24, 2015 #3


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    Science Advisor

    [itex]e^{-3t+ 3}= (e^3)e^{-3t}[/itex]. The "+ 3" just gives a specific value to your constant "a".
  5. Oct 24, 2015 #4

    Ray Vickson

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    Science Advisor
    Homework Helper

    This is not an IVP, because you have not given any initial values. That is what the "IV" stands for.
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