- #1
Saladsamurai
- 3,020
- 7
Homework Statement
a) Show (using Gaussian Elimination) that the following sets of equations have infinitely many solutions and b) express the solution in terms of parameters.
[itex]x_1+2x_2+x_3=2[/itex]
[itex]2x_1-x_2+7x_3=-6[/itex]
[itex]-x_1+x_2-4x_3=4[/itex]
[itex]x_1-2x_2+5x_3=-6[/itex]
After G.E. I end up with the array
[tex]\left[\begin{array}{cccc}1&2&1&2\\ 0&1&-1&2\\0&0&0&0\\0&-4&4&-8\end{array}\right][/tex]
Row 3 implies infinite solutions.
It's part b I am stuck on.
For a solution the text gives:[itex]x_1=-2-3t,\ x_2=2+t,\ x_3=t\ \ \ (t\in R)[/itex]
I know it must be real simple to arrive at the above line, but what is the procedure to do it?