 3
 0
Member advised to present information more clearly in future posts
 Problem Statement

So I am wondering what the correct x[SUB]4[/SUB] is. From the method I was taught to expressing vector form I think that x[SUB]4[/SUB] should be the vector :
3
0
4
1
But all of the examples I have come across translate into vector form directly after the RREF which would make it :
3
4
0
1
Could someone clarify this for me?
 Relevant Equations

Matrix A is the first matrix shown in my attached image
N(A) is the nullspace of A
R(C) is the range of C