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

s3a

Basis for the column space of A problem: For #3(a) [ http://ocw.mit.edu/courses/mathematics/18-06sc-linear-algebra-fall-2011/ax-b-and-the-four-subspaces/exam-1/MIT18_06SCF11_ex1s.pdf ], how did the solution go from U to R? when c != 3

  • one year ago
  • one year ago

  • This Question is Closed
  1. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    It seems c was chosen to be 4 but why?

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

    divide the second row by (c-3)

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

    subtract row2 from row1

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

    and so on..

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

    c was not chosen to be 4

    • one year ago
  6. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    I get this: http://i.imgur.com/RIZgXlJ.jpg

    • one year ago
  7. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    with what you said

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

    good :)

    • one year ago
  9. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    Wait, I think we're miscommunicating. I meant that as in I did what you said and there are still "c"s floating around.

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

    well subtract (-4/(c-3))(row3) from row2 and subtract (2+4/(c-3))(row3) from row1

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

    i think you should look again row reduced echelon form

    • one year ago
  12. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    but wouldn't that have the position which currently has the leading ones' with "c"s?

    • one year ago
  13. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    Also, sorry for being slow right now, my brain is being overworked and I can't take a break because I have exams.

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

    no it won't

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

    look at the picture you uploaded

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

    row 3 is 1 1

    • one year ago
  17. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    OH!

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

    to get the row reduced echelon form, you will make everything zero above pivots right?

    • one year ago
  19. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes, I see it. :D Let me just confirm, I get the same answer.

    • one year ago
  20. ingenuus
    Best Response
    You've already chosen the best response.
    Medals 1

    well since row3 is 1 1 it will remove same things above ok i see you got it

    • one year ago
  21. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    I've confirmed that I got it. :D Thanks a lot.

    • one year ago
  22. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    !

    • one year ago
  23. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    "row 3 is 1 1" is what made me see it instantly.

    • one year ago
  24. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    (Just saying.)

    • one year ago
  25. ingenuus
    Best Response
    You've already chosen the best response.
    Medals 1

    good luck on your exam! :)

    • one year ago
  26. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    Thanks. :)

    • one year ago
  27. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    (Also, good luck on yours if you have any.)

    • one year ago
  28. s3a
    Best Response
    You've already chosen the best response.
    Medals 0

    Actually, I have another question. Why does it matter what c is equal to if it dissapears thanks to elimination? (Sorry if that's a dumb question.)

    • 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.