**6. Fnd a linear system in the unknowns x1,x2,x3,…, that corresponds to the given augmented matrix.**

Consider the matrix

We have that the linear system of two equations in the four unknowns x1, x2, x3, and x4 given by

has A as its augmented matrix.

Consider the matrix

We have that the linear system of two equations in the four unknowns x1, x2, x3, and x4 given by

has A as its augmented matrix.