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

Mathematics
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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?
No..
would you write the matrix as 4 -1 1 2

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

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