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