A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

How do I find the price of a cd if 3 cd + 2 DVD=$67. And 2cd+4dvd=$90 ?

  • This Question is Closed
  1. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    looks to me like you will have to set up a system of equations and use either the elimination methode or the subtution methode to solve this problem

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

    zbay is exactly correct. But if you have a graphing calculator, you could set up a matrix.

  3. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I set up a graph but got stuck

  4. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    do it this way 3c+2d=67 2c+4d=90

  5. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    there is your system of equations

  6. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I tried that too but got stuck

  7. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok where did you get stuck at? and what methode were you trying?

  8. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I tried both. I set up a chart but sine the two are not right next to each other on the chart I got stuck.

  9. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh it's been a while for me but lets try this together

  10. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok!

  11. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok, first we want to pick a varible and make it an oppisite inverse of the other equation i am going to do this by multiplying the top function by -2

  12. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    (-2)(3c+2d=67) -6c-4d=-134

  13. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Do u know how to do it using a graph? Btw thanks for all your help.

  14. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    -6c-4d=-134 2c+4d=90 No i don't think i know how to do the graph

  15. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok that is fine

  16. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    when we combine them we get (-4c=-44)

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

    d= 11

  18. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Your awesome ,,, thanks

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

    c=15

  20. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok after you have your d value plug it into your orginal equation and solve for c

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

    Got it:)

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

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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.