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[tex] {x}^{2} - {y}^{2} = 25 \\ x + y = 25 \\ \\ {x}^{2} - {y}^{2} = 25 \\ x = 25 - y \\ \\ (25 - y {)}^{2} - {y}^{2} = 25 \\ x = 25 - y \\ \\ 625 - 50y + {y}^{2} - {y}^{2} = 25 \\ x = 25 - y \\ \\ - 50y = - 600 \\ x = 25 - y \\ \\ y = 12 \\ x = 13[/tex]

Ответ:

Объяснение:..............