Given the augmented matrix below, solve the associated system of equations.
For your
variables, use x1 , x2 , x3 , x4 , x5 , x6 , x7 ,
and x8 .

\displaystyle\left[\begin{array}{rrrrrrrr|r}
1 &5 &9 &1 &-5 &4 &-2 &2 &7 \cr
0 &0 &1 &-2 &4 &5 &1 &-6 &-2 \cr
0 &0 &0 &0 &1 &1 &-5 &0 &4 \cr
0 &0 &0 &0 &0 &1 &6 &7 &4 \cr
\end{array}\right]

The solution is ( , , ,
, , , ,
)

The solution is (

You can earn partial credit on this problem.