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

liliy Group Title

matrix: 2x+3y+ 7z= 13 3x+2y - 5z = -22 5x+7y - 3z = -28

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. liliy Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @phi can you help me?

    • 2 years ago
  2. precal Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    use elimination

    • 2 years ago
  3. liliy Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    what does that mean?

    • 2 years ago
  4. precal Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    multiply -3 to the first equation multiply 2 to the second equation

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

    we have to use matrix

    • 2 years ago
  6. precal Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    idea is to get rid of one variable at a time matrix - even better can you put it in the calculator?

    • 2 years ago
  7. precal Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1338861644110:dw|

    • 2 years ago
  8. liliy Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    hahah. no calculators.. this is linear algebra

    • 2 years ago
  9. precal Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yes, well the idea is still the same except with not using the variables

    • 2 years ago
  10. precal Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    sorry it has been a long time since I have done linear algebra. I just remember it was my favorite course during my undergrad days....... :)

    • 2 years ago
  11. liliy Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i dont understand the matrix . can you brief me, i feel like my numbers are always wrong and then the whole thing is wrong

    • 2 years ago
  12. liliy Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    if i get a matrix of numbers and when it simplifies: 1 0 3 8 0 0 9 3 0 0 8 9

    • 2 years ago
  13. liliy Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    these are arbitrarty numbers but if i get two rows that have 0 0 does that mean its bad?

    • 2 years ago
  14. precal Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1338861963247:dw| this is your goal in the end

    • 2 years ago
  15. precal Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    if it has a solution

    • 2 years ago
  16. liliy Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    right, but if you have any rows that are all zeros that means what?

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

    |dw:1338862078583:dw|

    • 2 years ago
  18. liliy Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    k, like:: 2 4 6 -8 3 6 7 10

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

    this one has a solution x=-1, y=-2, z=3

    • 2 years ago
  20. precal Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1338862146454:dw| you goal is to create that solution form (sorry I can't even remember its official name, may I be forgiven by the math gods) I would multipy the first row by (1/2) that would force that first term to turn into a 1 but don't forget to change all the other numbers in that row

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

    I think that is called row multiplication

    • 2 years ago
  22. precal Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    http://www.wyzant.com/Help/Math/Precalculus/Systems_Of_Equations/Matrix_Method.aspx

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

    got it, but for the little example i just posted: 2 4 6 -8 3 6 7 10, this matrix, i get the bottom row is 0 0 .. and none of the multiple choices look like that, what am i doing wrong?

    • 2 years ago
  24. precal Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    not sure, I put it in my calculator and it does have a solution

    • 2 years ago
  25. precal Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    sorry reposted your question but label it, must use the matrix (linear algebra) good luck :) sorry

    • 2 years 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.