Ответ:
[tex]x - y = 4 \\ x + y = 30 \\ \\ x = 4 + y \\ 4 + y + y = 30 \\ \\ 2y = 30 - 4 \\ 2y = 26 \\ y = 13 \\ x = 4 + 13 = 17[/tex]
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Ответ:
[tex]x - y = 4 \\ x + y = 30 \\ \\ x = 4 + y \\ 4 + y + y = 30 \\ \\ 2y = 30 - 4 \\ 2y = 26 \\ y = 13 \\ x = 4 + 13 = 17[/tex]