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Сложи почленно уравнения данной системы.

\(\begin{cases} -2x+3y=5, \\ 2x-y=-1;\end{cases} \)

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\(2y=4\) .

1. \(\begin{cases} 4x-10y=1, \\ 7x+10y=21; \end{cases}\)

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2. \(\begin{cases} 4x-y=-1, \\ 2x+y=2;\end{cases}\)

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3. \(\begin{cases} -5x-2y=10, \\ 5x-8y=0; \end{cases}\)

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4. \( \begin{cases} x+y=7, \\ -x-3y=-1; \end{cases}\)

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