\[\boxed{\text{986\ (986).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[2x - 3y = - 6\ \ \ \ \ и\ \ \ \ \]
\[\ 4x + y = a;\ \ \ \ y = 0\]
\[2x - 3 \cdot 0 = - 6\]
\[2x = - 6\]
\[x = - 3.\]
\[4x + y = a\text{\ \ }\]
\[4 \cdot ( - 3) + 0 = a \Longrightarrow \ \ a = - 12\]
\[Ответ:a = - 12.\]
\[\boxed{\text{986.\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ описательный\ способ;\]
\[2)\ от\ 1\ до\ 6;\]
\[Число\] | \[11\] | \[12\] | \[13\] | \[14\] | \[15\] | \[16\] | \[17\] | \[18\] | \[19\] |
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\[Остаток\ от\ деления\] | \[5\] | \[0\] | \[1\] | \[2\] | \[3\] | \[4\] | \[5\] | \[0\] | \[1\] |