Предмет: Математика, автор: qkrissew

За 11 зошитів і 8 ручок заплатили 49 грн. Скільки коштує 1 зошит і 1 ручка, якщо 5 зошитів дорожчі за 4 ручки на 7 грн. Вирішіть за допомогою системи лінійних рівнянь

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Автор ответа: Medved23

81

Нехай зошит коштує х грн, ручка - у грн. За умовою складаємо систему. Розв'язавши її, отримуємо, що х = 3 грн - ціна одного зошита, у = 2 грн - ціна однієї ручки

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