On the augmented matrix, each row represents an equation of the linear system. From left to right, the first three elements of the row represent the coefficients of the variables in order, the last element represent the right side of the equation.
On the third row we have the elements 3 8 0 4, which gives to us the following equation
[tex]\begin{gathered} 3\cdot x+8\cdot y+0\cdot z=4 \\ 3x+8y=4 \end{gathered}[/tex]
