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Math Help - please help me with finding the volume of the solid rotain about y-axis

  1. #1
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    please help me with finding the volume of the solid rotain about y-axis

    I m having trouble with finding the volume of the solid generated by
    rotating the region about the y-aixs

    Two equations are given:

    1/ y=4/x
    2/ y= -x+5

    I sketched these two and got intersections

    (1,4) and (4,1)


    What formulars should I use and could you explain answers with steps

    Thank you so much for your help!
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  2. #2
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    Quote Originally Posted by mookie View Post
    I m having trouble with finding the volume of the solid generated by
    rotating the region about the y-aixs

    Two equations are given:

    1/ y=4/x
    2/ y= -x+5

    I sketched these two and got intersections

    (1,4) and (4,1)


    What formulars should I use and could you explain answers with steps

    Thank you so much for your help!
    this can be done using washers w/r to y or cylindrical shells w/r to x
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