+0  
 
0
547
9
avatar

how do you use an inverse matrix to solve the linear system 5x+y=6 9x=2y=30

Guest Nov 13, 2014

Best Answer 

 #6
avatar+26640 
+10

Might be a different Anonymous Melody.  That's the problem with Anonymous - he/she is a multi-headed beast!

.

Alan  Nov 13, 2014
Sort: 

9+0 Answers

 #1
avatar+92221 
+5

There is an error in your question.

You have 2 equal signs in your second equation.  

Melody  Nov 13, 2014
 #2
avatar+26640 
+5

If we assume your second equation is 5x + 2y = 30 (because there are + and = signs on the same key on many keyboards) then:

Matrix solution

.

Alan  Nov 13, 2014
 #3
avatar
0

Hi Alan, you missed two negative signs in your definition of Inv(M).

Guest Nov 13, 2014
 #4
avatar+26640 
+10

No, I don't think so:

Matrix inversion

Or did you mean in the general expression with the a, b, c and d?  Here you need to look closely at the top right and bottom left terms to see the minus signs. At a glance they can look like a continuation of the division line!  This is a facet of the software I used to generate the expression - I've missed them myself in the past! 

.

Alan  Nov 13, 2014
 #5
avatar+92221 
+5

You know anon - picking up possible errors is fine but it is important to throw in a thank you as well.

Alan did a lot of work on your behalf!

Melody  Nov 13, 2014
 #6
avatar+26640 
+10
Best Answer

Might be a different Anonymous Melody.  That's the problem with Anonymous - he/she is a multi-headed beast!

.

Alan  Nov 13, 2014
 #7
avatar+92221 
+5

Hi Alan,

Even if it is a different anon they can still acknowledge the work that you have done.

Melody  Nov 13, 2014
 #8
avatar+26640 
+5

Hi Melody,

 

Because the message started with the words "Hi Alan,..." I took it as a friendly pointer to a possible error (let's face it, I make enough mistakes!).

.

Alan  Nov 13, 2014
 #9
avatar+92221 
0

We all make mistakes, you certainly do not make any more than any one else.  :)))

Melody  Nov 13, 2014

23 Online Users

avatar
avatar
avatar
avatar
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details