Решебник по математике 6 класс Виленкин Часть 1, 2 Часть 2. Параграф 5. Решение уравнений Проверочная работа №2. Решение уравнений

\[\boxed{\mathbf{Проверочная\ работа\ №2.\ Решение\ уравнений}}\]

\[\boxed{\text{1.}}\]

\[2x = x - 6\]

\[2x - x = - 6\]

\[x = - 6.\]

\[\boxed{\text{2.}}\]

\[\frac{1}{3}y + 1 = - 2\ \]

\[\frac{1}{3}y = - 2 - 1\]

\[\frac{1}{3}y = - 3\]

\[y = - 3 \cdot 3\]

\[y = - 9.\]

\[\boxed{\text{3.}}\]

\[5x - 21 = 2x\]

\[5x - 2x = 21\]

\[3x = 21\]

\[x = 21\ :3\]

\[x = 7.\]

\[\boxed{\text{4.}}\]

\[3y - 4 = y + 8\]

\[3y - y = 8 + 4\]

\[2y = 12\]

\[y = 12\ :2\]

\[y = 6.\]

\[\boxed{\text{5.}}\]

\[Да.\]

\[\boxed{\text{6.}}\]

\[3x - 15 = x + 15\]

\[\boxed{\text{7.}}\]

\[\frac{2 - x}{9} = \frac{2}{3}\ \ \ \ \ | \cdot 9\]

\[2 - x = 6\]

\[- x = 6 - 2\]

\[- x = 4\]

\[x = - 4.\]

\[Да.\]

\[\boxed{\text{8.}}\]

\[Нет,\ надо\ умножить\ на\ 6.\]