a) \( \begin{cases} y = 2 - 3x \\ 5x + 4y = -6 \end{cases} \)
\[5x + 4(2 - 3x) = -6\]
\[5x + 8 - 12x = -6\]
\[-7x = -14\]
\[x = \frac{-14}{-7} = 2\]
\[y = 2 - 3(2) = 2 - 6 = -4\]
Ответ: \(x = 2, y = -4\)
б) \( \begin{cases} 6x - y = 4 \\ 3x + 5y = 13 \end{cases} \)
\[y = 6x - 4\]
\[3x + 5(6x - 4) = 13\]
\[3x + 30x - 20 = 13\]
\[33x = 33\]
\[x = \frac{33}{33} = 1\]
\[y = 6(1) - 4 = 6 - 4 = 2\]
Ответ: \(x = 1, y = 2\)
a) \( \begin{cases} 2x - 2y = 7 \\ 3x + 2y = 3 \end{cases} \)
\[(2x - 2y) + (3x + 2y) = 7 + 3\]
\[5x = 10\]
\[x = \frac{10}{5} = 2\]
\[3(2) + 2y = 3\]
\[6 + 2y = 3\]
\[2y = -3\]
\[y = \frac{-3}{2} = -1.5\]
Ответ: \(x = 2, y = -1.5\)
б) \( \begin{cases} 5x - 4y = 8 \\ x - y = 2 \end{cases} \)
\[x = y + 2\]
\[5(y + 2) - 4y = 8\]
\[5y + 10 - 4y = 8\]
\[y = -2\]
\[x = -2 + 2 = 0\]
Ответ: \(x = 0, y = -2\)