Representing a linear system as a matrix  Matrices
Representing a linear system as a matrix
Lessons
Notes:
We can represent a linear system as a matrix. For example, the linear system
$1x+2y+3z=4$
$5x+6y+7z=8$
$9x+10y+11z=12$
can be represented as the matrix:
where $x,y,z$ are variables and the vertical line represents the equal sign for each linear equation. We see all the $x,y,z$’s disappear, and we take all the coefficients and the numbers after the equal sign.

2.
Representing a linear system as a matrix
Represent each linear system as a matrix: 
3.
Representing a matrix as a linear system
Represent each matrix as a linear system: