Предмет: Алгебра, автор: Костровская

Ученик за 3 тетради и 2 карандаша уплатил 6р 60 коп, другой ученик за такие же 2 тетради и 2 карандаша уплатил 4р 60 коп. сколько стоила тетрадь и сколько стоит карандаш?
РЕШИТЬ СИСТЕМОЙ УРАВНЕНИЙ!!!!!

Ответы

Автор ответа: tanyshik607

16

пусть тетрадь стоит х, карандаш - у
3х+2у=6,6 вычтем из 1 уравнения 2 3х+2у=6,6 6+2у=6,6 у=0,3
2х+2у=4,6 х=2 х=2 х=2
2рубля стоит тетрадь, 30 копеек стоит карандаш

Костровская: а можете подробнее объяснить откуда что взялось пожалуйста

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