Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

EmmaH

  • 2 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...:(

  • This Question is Closed
  1. AriPotta
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    "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
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ok one sec..

  3. EmmaH
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    -3?

  4. EmmaH
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    oh so its false?

  5. AriPotta
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

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

  6. AriPotta
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    does x = 9?

  7. EmmaH
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    no x=3 it says so in the prob

  8. AriPotta
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ok sso its false though?

  10. EmmaH
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    *so

  11. AriPotta
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    why do you think it's false? are you just guessing? :/

  12. AriPotta
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    or did you do the math

  13. EmmaH
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    i did the math -9=3k so -9/3=3k/3 k=-3 right o9r am i totaolly off?

  14. AriPotta
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yea, k = -3, but we're trying to find out what x equals when y = 27

  15. EmmaH
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    x=-9

  16. AriPotta
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes! which is not 9. so it's false. good job :)

  17. elisichi
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    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
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yay :) =D :D =)

  19. elisichi
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Sorry I just realised I came in a little too late

  20. EmmaH
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    thanks guys...wait are you both guys right?

  21. elisichi
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I'm a girl :D But close enough!

  22. EmmaH
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    hu ....but thanks anyways

  23. elisichi
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Anytime!

  24. AriPotta
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    i'm a

    1 Attachment
  25. elisichi
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    hahahahah

  26. EmmaH
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    lolo thats a way of saying it :)

  27. AriPotta
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    :)

  28. Not the answer you are looking for?
    Search for more explanations.

    Search OpenStudy
    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.