\[2px + 3y + 5p = 0;\ \ \ \ \ \ \ \ \ \ \ \ \ \ \]
\[(1,5;\ - 4)\]
\[2p \cdot 1,5 + 3 \bullet ( - 4) + 5p = 0\]
\[3p + 5p - 12 = 0\]
\[8p = 12\]
\[p = \frac{12}{8}\]
\[p = 1,5.\]
\[Ответ:\ \ при\ \ p = 1,5.\]