### Home > GB8I > Chapter 9 Unit 10 > Lesson INT1: 9.3.1 > Problem9-73

9-73.

Solve the system of equations at right algebraically.

Try using substitution to solve this system of equations.

$\left. \begin{array} { r } { 2 x - 3 y = 12 } \\ { y + x = - 9 } \end{array} \right.$