11.6E: Solving Systems with Gaussian Elimination (Exercises)
For the following exercises, write the system of linear equations from the augmented matrix. Indicate whether there will be a unique solution.
51. \(\left[\begin{array}{rrr|r}1 & 0 & -3 & 7 \\ 0 & 1 & 2 & -5 \\ 0 & 0 & 0 & 0\end{array}\right]\)
52. \(\left[\begin{array}{rrr|r}1 & 0 & 5 & -9 \\ 0 & 1 & -2 & 4 \\ 0 & 0 & 0 & 3\end{array}\right]\)
For the following exercises, write the augmented matrix from the system of linear equations.
53.
\(-2 x+2 y+z=7\)
\(2 x-8 y+5 z=0 \)
\(19 x-10 y+22 z=3\)
54.
\(4 x+2 y-3 z=14\)
\(-12 x+3 y+z=100\)
\(9 x-6 y+2 z=31\)
55.
\(x+3 z=12\)
\(-x+4 y=0\)
\(y+2 z=-7\)
For the following exercises, solve the system of linear equations using Gaussian elimination.
56.
\(3 x-4 y=-7\)
\(-6 x+8 y=14\)
57
\(3 x-4 y=1\)
\(-6 x+8 y=6\)
58.
\(-1.1 x-2.3 y=6.2\)
\(-5.2 x-4.1 y=4.3\)
59.
\(2 x+3 y+2 z=1\)
\(-4 x-6 y-4 z=-2\)
\(10 x+15 y+10 z=0\)
60.
\(-x+2 y-4 z=8\)
\(\quad 3 y+8 z=-4\)
\(-7 x+y+2 z=1\)