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anonymous

  • one year ago

I need help on a precalc question, medal and fan: Find an equation in standard form for the ellipse with the vertical major axis of length 18, and minor axis of length 6. Please just walk me through it so I know how to do it.

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  1. anonymous
    • one year ago
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    @ganeshie8 can you get someone on here to help me?

  2. anonymous
    • one year ago
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    @thomaster

  3. anonymous
    • one year ago
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    @phi

  4. anonymous
    • one year ago
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    please dude

  5. phi
    • one year ago
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    do you know the generic equation for an ellipse?

  6. anonymous
    • one year ago
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    x^2/a^2 + y^2/b^2 = 1

  7. phi
    • one year ago
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    ok, and generally the a is the semi major-diameter (1/2 of the longer diameter) if the y direction is longer, you put the a^2 underneath the y

  8. anonymous
    • one year ago
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    ok so now what values do I have to plug in?

  9. phi
    • one year ago
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    vertical major axis of length 18, that is telling you the y direction is the major axis the 18 is the entire height of the ellipse. you want 1/2 of that for "a"

  10. phi
    • one year ago
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    minor axis of length 6 that is the width of the ellipse. you want 1/2 of that for b

  11. anonymous
    • one year ago
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    so 9^2 =81 y^2/81 + x^2/b^2 = 1

  12. phi
    • one year ago
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    so far, so good

  13. anonymous
    • one year ago
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    so now what about b?

  14. phi
    • one year ago
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    I posted about "b" up above.

  15. anonymous
    • one year ago
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    oh lol sorry, so 3^2 = 9 y^2/81 + x^2/9 = 1?

  16. phi
    • one year ago
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    yes

  17. anonymous
    • one year ago
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    can you help with another?

  18. anonymous
    • one year ago
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    @ phi ? Find all polar coordinates of point P where P = (5,-pi/6)

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