Предмет: Математика, автор: KrilkovaArina

Помогите решить четвертое задание, пожалуйста!

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Автор ответа: miron2077

исходную систему не пишу
3х-3=5у+5
42х-18у=50х-10у-15х-15у
3х-5у=8
7х+7у=0
домножим первое на 7, второе на 3
21х-35у=56
21х+21у=0
вычтем из первого второе
-56у=56
у=-1
из первого ур-я
х=(8+5у)/3=(8-5)/3=1
х=1

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