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kenneyfamily
 3 years ago
4x  y = 1
x + 2y = 7
how could i solve this using an inverse matrix?
kenneyfamily
 3 years ago
4x  y = 1 x + 2y = 7 how could i solve this using an inverse matrix?

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tkhunny
 3 years ago
Best ResponseYou've already chosen the best response.01) 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?

kenneyfamily
 3 years ago
Best ResponseYou've already chosen the best response.0would you write the matrix as 4 1 1 2

tkhunny
 3 years ago
Best ResponseYou've already chosen the best response.0That is part #1. Very good. Next...

kenneyfamily
 3 years ago
Best ResponseYou've already chosen the best response.0what do you mean by augment it by I2?

tkhunny
 3 years ago
Best ResponseYou've already chosen the best response.0\[\left[\begin{matrix}4 & 1 & 1 & 0\\ 1 & 2 & 0 & 1\end{matrix}\right]\]

kenneyfamily
 3 years ago
Best ResponseYou've already chosen the best response.0why did you do that? sorry i'm confused

tkhunny
 3 years ago
Best ResponseYou've already chosen the best response.0Well, this is one very useful way to find an Inverse Matrix. You've never seen it, before?

kenneyfamily
 3 years ago
Best ResponseYou've already chosen the best response.0I may have but I forgot how to do it

tkhunny
 3 years ago
Best ResponseYou've already chosen the best response.0How about "Elementary Row Operations"? Any of those floating around in your bag of tricks?

kenneyfamily
 3 years ago
Best ResponseYou've already chosen the best response.0I wish I could say yes but no. I'm retaking a precalc course because i failed it the first time

tkhunny
 3 years ago
Best ResponseYou've already chosen the best response.0Well, 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
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