Предмет: Другие предметы, автор: alisaklimova2000

может пожалуйста срочно решить,спасибо заранее))​

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Автор ответа: averbicki67
1

2x+1y = 450    y=450-2x

3x+2y=765      3x+2(450-2x)

                        3x+900-4x=765

                        900-765=4x-3x

                        x=135-Детский билет

                        y=450-2(135)

                        y=180-Взрослый билет

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