how to determine solution of reduced row echelon form?

Question

Using the given matrix in reduced row echelon form, determine the solution of the corresponding system of linear equations. Then enter the solution* of x1 in the box.

*If there is one free variable, set x4=t, if there are two free variables set x3=s and x4=t, and if the system is inconsistent type

"inconsistent" in the box.

[10000

10000

100001| 10 15

−19

−9]

x1=

Answer 1

It appears there are multiple mistakes in both the square matrix (reduced row-echelon form) and the column vector. Without these corrections it is not possible to go further.