\[\boxed{\text{259\ (}\text{с}\text{).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ y = \frac{3x}{8} = \frac{3}{8} \cdot x - прямая\ \]
\[\textbf{б)}\ y = \frac{8}{3x} = \frac{8}{3} \cdot \frac{1}{x} - гипербола\]
\[\boxed{\text{259\ (}\text{н}\text{).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ y = \frac{|2x - 18|}{x - 9};\ \ \ \ \ \ x \neq 9\]
\[при\ x > 9:\]
\[y = \frac{2x - 18}{x - 9} = \frac{2 \cdot (x - 9)}{x - 9} = 2.\]
\[при\ x < 9:\]
\[y = \frac{18 - 2x}{x - 9} = \frac{- 2 \cdot (x - 9)}{x - 9} =\]
\[= - 2.\]
\[\textbf{б)}\ y = \frac{|x + 3|}{3x + 9};\ \ x \neq - 3\ \]
\[при\ x > - 3:\]
\[y = \frac{x + 3}{3 \cdot (x + 3)} = \frac{1}{3}\text{.\ }\]
\[при\ x < - 3:\]
\[y = \frac{- x - 3}{3x + 9} = \frac{- (x + 3)}{3 \cdot (x + 3)} =\]
\[= - \frac{1}{3}.\]