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anonymous

  • one year ago

Help ASAP For the inverse variation equation xy = k, what is the constant of variation, k, when x = –3 and y = –2

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  1. anonymous
    • one year ago
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    –6 -2/3 3/2 6

  2. skullpatrol
    • one year ago
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    Any ideas?

  3. anonymous
    • one year ago
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    -2/3 would be my guess

  4. skullpatrol
    • one year ago
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    Guessing randomly doesn't work in math :-) Please give a reason.

  5. anonymous
    • one year ago
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    because usually its x/y right? so the inverse would be y/x

  6. skullpatrol
    • one year ago
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    You are correct that "usually" you see expressions like x/y in class and the inverse of x/y is y/x, but that is not what this question is asking for.

  7. anonymous
    • one year ago
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    So its 6?

  8. anonymous
    • one year ago
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    no that doesnt make sense

  9. skullpatrol
    • one year ago
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    Yes. 6 is correct :-)

  10. skullpatrol
    • one year ago
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    For the inverse variation equation xy = k, what is the constant of variation, k, when x = –3 and y = –2 x * y = k -3 (-2) = 6

  11. anonymous
    • one year ago
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    Thank you! Can you help me with another one?

  12. skullpatrol
    • one year ago
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    I can try.

  13. anonymous
    • one year ago
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    The inverse variation equation shows the relationship between wavelength in meters, x, and frequency, y. y=3x10^8/x What is the wavelength for radio waves with frequency 3 × 10^9? 1 × 10^–1 m 3 × 10^–1 m 3 × 10^17 m 9 × 10^17 m

  14. skullpatrol
    • one year ago
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    Any ideas?

  15. skullpatrol
    • one year ago
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    |dw:1438892577073:dw|

  16. anonymous
    • one year ago
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    so find y=3x10^8/x

  17. skullpatrol
    • one year ago
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    Read the problem carefully. Decide what unknown number is being asked for.

  18. anonymous
    • one year ago
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    3x10^9?

  19. skullpatrol
    • one year ago
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    that's not an answer choice

  20. anonymous
    • one year ago
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    I still dont understand

  21. skullpatrol
    • one year ago
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    what is the question asking for?

  22. anonymous
    • one year ago
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    What is the wavelength for radio waves with frequency 3 × 10^9

  23. skullpatrol
    • one year ago
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    Good, where is the wavelength in the formula they gave you?

  24. anonymous
    • one year ago
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    wavelength is x and frequency is y

  25. skullpatrol
    • one year ago
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    so they want you to find x, right?

  26. anonymous
    • one year ago
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    yes

  27. skullpatrol
    • one year ago
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    |dw:1438893690522:dw|

  28. skullpatrol
    • one year ago
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    |dw:1438893825211:dw|

  29. skullpatrol
    • one year ago
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    Ok so far?

  30. anonymous
    • one year ago
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    yes

  31. skullpatrol
    • one year ago
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    Do you know how to solve for x?

  32. anonymous
    • one year ago
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    I plugged it in but it came out to be 1

  33. skullpatrol
    • one year ago
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    plugged what in?

  34. anonymous
    • one year ago
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    is it A?

  35. anonymous
    • one year ago
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    (3*10^9)=(3*10^8)/x

  36. anonymous
    • one year ago
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    x=1/10

  37. skullpatrol
    • one year ago
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    Correct :-)

  38. anonymous
    • one year ago
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    Thank you!

  39. skullpatrol
    • one year ago
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    Thanks for trying :D

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