1. ## Helps solving 4x5

Solve:

x1 x2 x3 x4
5 -6 4 4 = 0
-1 1 2 2 = 5
4 -5 6 6 = 5
2 -2 -4 -4 =-10

(x1
x2 = ( ) + ( ) s + ( ) t
x3
x4)

2. Originally Posted by cityfrontsailor
Solve:

x1 x2 x3 x4
5 -6 4 4 = 0
-1 1 2 2 = 5
4 -5 6 6 = 5
2 -2 -4 -4 =-10

(x1
x2 = ( ) + ( ) s + ( ) t
x3
x4)
Do the rref. of: $\begin{bmatrix}
5 & -6 & 4 & 4 & 0\\
-1 & 1 & 2 & 2 & 5\\
4 & -5 & 6 & 6 & 5\\
2 & -2 & -4 & -4 & -10
\end{bmatrix}$