y=-38x+15 и y=-21x-36.
\[\left\{ \begin{matrix} y = - 38x + 15 \\ y = - 21x - 36 \\ \end{matrix} \right.\ \]
\[- 38x + 15 = - 21x - 36\]
\[- 38x + 21x = - 36 - 15\]
\[- 17x = - 51\]
\[x = 3.\]
\[y = - 38 \cdot 3 + 15 = - 114 + 15 = - 99.\]
\[Ответ:(3;\ - 99).\]