Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Katieann16 Group Title

y varies directly with x, and y = 2 when x = 5. What is the value of x when y = 15?

  • one year ago
  • one year ago

  • This Question is Closed
  1. Katieann16 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    @jim_thompson5910

    • one year ago
  2. jim_thompson5910 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    y varies directly with x so this means y = kx where k is some fixed number

    • one year ago
  3. jim_thompson5910 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    we are told that y = 2 when x = 5 so y = kx 2 = k*5 solve for k

    • one year ago
  4. Katieann16 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    so 6?

    • one year ago
  5. jim_thompson5910 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    when you solved for k, what did you get

    • one year ago
  6. Katieann16 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    wait how do i solve for k

    • one year ago
  7. jim_thompson5910 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    2 = k*5 divide both sides by 5 to isolate k

    • one year ago
  8. jim_thompson5910 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    k = ???

    • one year ago
  9. Katieann16 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    2.5?

    • one year ago
  10. jim_thompson5910 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    you divided in the wrong order

    • one year ago
  11. Katieann16 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    0.4?

    • one year ago
  12. jim_thompson5910 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    good, so y = kx turns into y = 0.4x

    • one year ago
  13. jim_thompson5910 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    now you want to find x when y = 15, so y = 0.4x 15 = 0.4x now solve for x

    • one year ago
  14. Katieann16 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    37.5?

    • one year ago
  15. jim_thompson5910 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    you nailed it you can also represent 37.5 as the fraction 75/2

    • one year ago
  16. jim_thompson5910 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    so x = 37.5 or x = 75/2

    • one year ago
  17. Katieann16 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    ok thank you(:

    • one year ago
  18. jim_thompson5910 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    you're welcome

    • one year ago
    • Attachments:

See more questions >>>

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.