Bluebook试题6 · 第 19 题

\[\frac{7}{8}y-\frac{5}{8}x=\frac{4}{7}-\frac{7}{8}y\]\[\frac{5}{4}x+\frac{7}{4}=py+\frac{15}{4}\]In the given system of equations, \(p\) is a constant. If the system has no solution, what is the value of \(p\)?