\[y = - 0,83x + 16,2\]
\[D(y) = R;\]
\[E(y) = R;\]
\[y = 0:\]
\[- 0,83x + 16,2 = 0\]
\[- 0,83x = - 16,2\]
\[x = \frac{1620}{83} = 19\frac{43}{83}.\]
\[y > 0\ при\ x < 16\frac{43}{83};\]
\[y < 0\ при\ x > 16\frac{43}{83}.\]
\[Функция\ убывает.\]