\[y = - \frac{42}{x}:\]
\[значение\ функции,\]
\[если\ значение\ аргумента\ \]
\[равно\ 7;\ - 2;0,3.\]
\[x = 7 \Longrightarrow y = - \frac{42}{7} = - 6,\]
\[x = - 2 \Longrightarrow y = - \frac{42}{- 2} = 21.\]
\[x = 0,3 \Longrightarrow y = - \frac{42}{0,3} = - 140.\]