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EmmaH

  • 3 years ago

True or False? Y varies directly with x and y = -9 when x = 3. When y = 27, the value of x is 9. someone PLEASE explain...:(

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  1. AriPotta
    • 3 years ago
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    "y varies directly with x" is y = kx. we have to find out what k is. so we substitute -9 for y and 3 for x. -9 = 3k. can you tell me what k equals?

  2. EmmaH
    • 3 years ago
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    ok one sec..

  3. EmmaH
    • 3 years ago
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    -3?

  4. EmmaH
    • 3 years ago
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    oh so its false?

  5. AriPotta
    • 3 years ago
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    yep. so now we can substitute -3 for k and 27 for y to see if x equals 9. 27 = -3x

  6. AriPotta
    • 3 years ago
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    does x = 9?

  7. EmmaH
    • 3 years ago
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    no x=3 it says so in the prob

  8. AriPotta
    • 3 years ago
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    no, that says when x = 3, y = -9. y and x can be any number. k is the only variable that is constant

  9. EmmaH
    • 3 years ago
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    ok sso its false though?

  10. EmmaH
    • 3 years ago
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    *so

  11. AriPotta
    • 3 years ago
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    why do you think it's false? are you just guessing? :/

  12. AriPotta
    • 3 years ago
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    or did you do the math

  13. EmmaH
    • 3 years ago
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    i did the math -9=3k so -9/3=3k/3 k=-3 right o9r am i totaolly off?

  14. AriPotta
    • 3 years ago
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    yea, k = -3, but we're trying to find out what x equals when y = 27

  15. EmmaH
    • 3 years ago
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    x=-9

  16. AriPotta
    • 3 years ago
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    yes! which is not 9. so it's false. good job :)

  17. elisichi
    • 3 years ago
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    EmmaH, k=-3. So, now you substitute it in to check what x is when y=27 27=(-3)x x=-9 Therefore, it is false.

  18. EmmaH
    • 3 years ago
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    yay :) =D :D =)

  19. elisichi
    • 3 years ago
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    Sorry I just realised I came in a little too late

  20. EmmaH
    • 3 years ago
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    thanks guys...wait are you both guys right?

  21. elisichi
    • 3 years ago
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    I'm a girl :D But close enough!

  22. EmmaH
    • 3 years ago
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    hu ....but thanks anyways

  23. elisichi
    • 3 years ago
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    Anytime!

  24. AriPotta
    • 3 years ago
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    i'm a

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  25. elisichi
    • 3 years ago
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    hahahahah

  26. EmmaH
    • 3 years ago
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    lolo thats a way of saying it :)

  27. AriPotta
    • 3 years ago
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    :)

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