Предмет: Алгебра, автор: antongorohov

Найдите решение системы:
5х-3у/4=х-5у/3,
7х+у=12;
Помогите пжл!!!!

dnepr1: При применении косой черты как знака дроби надо отделять отдельные элементы выражения: как правильно (5х-3у)/4=(х-5у)/3 или 5х-(3у/4)=х-(5у/3), или ещё другие варианты могут быть????

Ответы

Автор ответа: Аноним

0

15x-9y=4x-20y⇒15x-4x=9y-20y⇒11x=-11y⇒x=-y
7x+y=12
7x-x=12
6x=12
x=2
y=-2

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