Решаем систему методом подстановки.
\[ y = 14 - 5x \]
\[ 2x - 3(14 - 5x) = 9 \]
\[ 2x - 42 + 15x = 9 \]\[ 17x = 9 + 42 \]\[ 17x = 51 \]\[ x = \frac{51}{17} \]\[ x = 3 \]
\[ y = 14 - 5(3) \]\[ y = 14 - 15 \]\[ y = -1 \]
Ответ: x = 3, y = -1
x = 3, y = -1