Решим уравнение:
$$\frac{7}{8}y = 1\frac{1}{4}$$ $$\frac{7}{8}y = \frac{5}{4}$$ $$y = \frac{5}{4} : \frac{7}{8}$$ $$y = \frac{5}{4} \cdot \frac{8}{7}$$ $$y = \frac{5 \cdot 2}{1 \cdot 7}$$ $$y = \frac{10}{7}$$ $$y = 1\frac{3}{7}$$Ответ: $$y = 1\frac{3}{7}$$