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kenneyfamily Group Title

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

  • 2 years ago
  • 2 years ago

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  1. tkhunny Group Title
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    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 years ago
  2. kenneyfamily Group Title
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    No..

    • 2 years ago
  3. kenneyfamily Group Title
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    would you write the matrix as 4 -1 1 2

    • 2 years ago
  4. tkhunny Group Title
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    That is part #1. Very good. Next...

    • 2 years ago
  5. kenneyfamily Group Title
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    what do you mean by augment it by I2?

    • 2 years ago
  6. tkhunny Group Title
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    \[\left[\begin{matrix}4 & -1 & 1 & 0\\ 1 & 2 & 0 & 1\end{matrix}\right]\]

    • 2 years ago
  7. kenneyfamily Group Title
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    why did you do that? sorry i'm confused

    • 2 years ago
  8. tkhunny Group Title
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    Well, this is one very useful way to find an Inverse Matrix. You've never seen it, before?

    • 2 years ago
  9. kenneyfamily Group Title
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    I may have but I forgot how to do it

    • 2 years ago
  10. tkhunny Group Title
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    How about "Elementary Row Operations"? Any of those floating around in your bag of tricks?

    • 2 years ago
  11. kenneyfamily Group Title
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    I wish I could say yes but no. I'm retaking a pre-calc course because i failed it the first time

    • 2 years ago
  12. tkhunny Group Title
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    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

    • 2 years ago
  13. kenneyfamily Group Title
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    ok thanks!!

    • 2 years ago
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