Question

Срочно!!!!!!!!!!! даю 20 балов ​

Answer 1

Ответ:

$x - y = 4 \\ x + y = 30 \\ \\ x = 4 + y \\ 4 + y + y = 30 \\ \\ 2y = 30 - 4 \\ 2y = 26 \\ y = 13 \\ x = 4 + 13 = 17$