## Algebra and Trigonometry 10th Edition

$\begin{bmatrix} 3 & -2 & |-27\\ 1 & 3 & |13\\ \end{bmatrix}$ ~ $\begin{bmatrix} 3 & -2 & |-27\\ 0 & -11 & |-66\\ \end{bmatrix}$ Back-Substitution: -11y = -66 y = 6 3x - 2(6) = -27 3x - 12 = -27 x = -5 x = -5 y = 6