Consider a system
with the given row-echelon form for its augmented matrix.
The equations for this system are
The last equation says *z* = 2. Substitute this into the second
equation to get
Now substitute *z* = 2 and *y* = –13
into the first equation to get
Thus the solution is *x* = –24, *y* = –13, and *z* =
2. |