\[\boxed{\text{987\ (987).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[9x + 7y = 35\ \ и\ \ \ \]
\[x + \text{by} = - 20;\ \ x = 0\]
\[0 + 7y = 35\]
\[7y = 35\]
\[y = 5.\]
\[x + \text{by} = - 20\]
\[0 + 5b = - 20 \Longrightarrow \ \ b = - 4\]
\[Ответ:\ b = - 4.\]
\[\boxed{\text{987.\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ Описательный\ способ.\]
\[2)\ y = 2x,\ \ 0 < x < 10\]
\[x\] | \[1\] | \[2\] | \[3\] | \[4\] | \[5\] | \[6\] | \[7\] | \[8\] | \[9\] |
---|---|---|---|---|---|---|---|---|---|
\[y\] | \[2\] | \[4\] | \[6\] | \[8\] | \[10\] | \[12\] | \[14\] | \[16\] | \[18\] |