Hi

I am hoping I am in the right spot - it is a linear algebra class but 1st year so take pity on me.....

A is 1 1 1 1

2 3 4 4

3 4 4 4

4 5 4 5

B is 4

5

6

3

So let's pretend that I did the calculation of A^-1 correctly....

I got

1 0 0 0 -1 0 -2 2

0 1 0 0 -4 3 -2 8

0 0 1 0 1 0 1 -1

0 0 0 1 0 -1 0 5

Now how do I tie A^-1 back to B do I really just multiply them and how does this tell me what is x1 and x2 etc.

Thanks for any insight you can give me....