5. Найдите корни уравнения: а) $$\frac{x}{-2.2} = \frac{4.9}{-2.8}$$; б) $$1 \frac{3}{14} - y = 2 \frac{7}{10}$$.

а) $$\frac{x}{-2.2} = \frac{4.9}{-2.8}$$ $$x = \frac{4.9 * (-2.2)}{-2.8}$$ $$x = \frac{-10.78}{-2.8}$$ $$x = 3.85$$ б) $$1 \frac{3}{14} - y = 2 \frac{7}{10}$$ $$\frac{17}{14} - y = \frac{27}{10}$$ $$y = \frac{17}{14} - \frac{27}{10}$$ $$y = \frac{85}{70} - \frac{189}{70}$$ $$y = \frac{-104}{70}$$ $$y = -\frac{52}{35}$$ **Ответ:** а) x = 3.85 б) y = -52/35