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Math Help - double integrals with e

  1. #1
    Junior Member plm2e's Avatar
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    double integrals with e

    (top = .5, bottom = 0)(top = infinity, bottom = 0) ye^(-xy) dxdy

    I am not sure how to do this one
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  2. #2
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    \int\limits_0^\infty  {ye^{ - xy} dx}  = \lim _{b \to \infty } \left. { - e^{ - xy} } \right|_{x = 0}^{x = b}
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  3. #3
    Junior Member plm2e's Avatar
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    Quote Originally Posted by Plato View Post
    \int\limits_0^\infty {ye^{ - xy} dx} = \lim _{b \to \infty } \left. { - e^{ - xy} } \right|_{x = 0}^{x = b}

    Im not sure where to go to take the next integral for dy.
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  4. #4
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    Quote Originally Posted by plm2e View Post
    Im not sure where to go to take the next integral for dy.
    Tell us. What is the value of that limit?
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  5. #5
    Junior Member plm2e's Avatar
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    0, i think, thats why im confused about the next step
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