anonymous
  • anonymous
4x - y = 1 x + 2y = 7 how could i solve this using an inverse matrix?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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tkhunny
  • tkhunny
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?
anonymous
  • anonymous
No..
anonymous
  • anonymous
would you write the matrix as 4 -1 1 2

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tkhunny
  • tkhunny
That is part #1. Very good. Next...
anonymous
  • anonymous
what do you mean by augment it by I2?
tkhunny
  • tkhunny
\[\left[\begin{matrix}4 & -1 & 1 & 0\\ 1 & 2 & 0 & 1\end{matrix}\right]\]
anonymous
  • anonymous
why did you do that? sorry i'm confused
tkhunny
  • tkhunny
Well, this is one very useful way to find an Inverse Matrix. You've never seen it, before?
anonymous
  • anonymous
I may have but I forgot how to do it
tkhunny
  • tkhunny
How about "Elementary Row Operations"? Any of those floating around in your bag of tricks?
anonymous
  • anonymous
I wish I could say yes but no. I'm retaking a pre-calc course because i failed it the first time
tkhunny
  • tkhunny
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
anonymous
  • anonymous
ok thanks!!

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