Предмет: Геометрия, автор: danabilokon

помогите пожалуйста

Знайдіть координати точки перетину прямих x+y=-1 iy- х = 3.

Ответы

Автор ответа: OblivionFire
3

{x+y=–1,{y–x=3;{x+y=–1,{–x+y=3;{x+y=–1,{x–y=–3;2x=–4,x=–4:2,x=–2;–2+y=–1,y=–1+2,y=1. Ответ:(–2;1)–точка пересечения.

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