Answer:
The augmented matrix is ...
[tex]\left[\begin{array}{ccc|c}0&-2&7&10\\9&5&0&1\\2&0&1&-5\end{array}\right][/tex]
Step-by-step explanation:
Missing variables essentially have a coefficient of zero. Coefficients are listed in the same order in each row, and the matrix is "augmented" by the column of constants on the right side of each equation.
