Предмет: Алгебра, автор: michiepetrovabts

реши способом подстановки систему уравнений​

Приложения:

Ответы

Автор ответа: daraprelj
1

Ответ:

(-7;8)

Объяснение:

\displaystyle \left \{ {{y-x=15} \atop {y^{2}-x^{2}=15}} \right.

\displaystyle \left \{ {{y=15+x} \atop {(15+x)^{2}-x^{2}=15}} \right.

Решим отдельно 2-е уравнение системы

\displaystyle(15+x)^{2}-x^{2}=15

\displaystyle 225+30x+x^{2}-x^{2}=15

\displaystyle 30x=15-225

\displaystyle 30x=-210

\displaystyle x=-7

\displaystyle y=15+(-7) = 8

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