Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

kenneyfamily

  • 3 years ago

4x - y = 1 x + 2y = 7 how could i solve this using an inverse matrix?

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

    1) Use the coefficients to form a 2x2 matrix. 2) Augment this matric by I2 3) Perform row operations to find the inverse of the original matrix. Are we ringing bells?

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

    No..

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

    would you write the matrix as 4 -1 1 2

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

    That is part #1. Very good. Next...

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

    what do you mean by augment it by I2?

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

    \[\left[\begin{matrix}4 & -1 & 1 & 0\\ 1 & 2 & 0 & 1\end{matrix}\right]\]

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

    why did you do that? sorry i'm confused

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

    Well, this is one very useful way to find an Inverse Matrix. You've never seen it, before?

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

    I may have but I forgot how to do it

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

    How about "Elementary Row Operations"? Any of those floating around in your bag of tricks?

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

    I wish I could say yes but no. I'm retaking a pre-calc course because i failed it the first time

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

    Well, you're going to have to get a few things up to speed. Finding an inverse matrix is an important skill. You'll have to start somewhere. Try this: http://www.youtube.com/watch?v=RsTdy2r9DHk

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

    ok thanks!!

  14. 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