Предмет: Алгебра, автор: olenaburkatska22

Сума двох чисел дорівнює 7, а їх різниця дорівнює 17. Знайдіть ці числа. ​

Ответы

Автор ответа: zinaidazina
17

\left \{ {{x+y=7} \atop {x-y=17}} \right.

\left \{ {{x+y=7} \atop {x=y+17}} \right.

\left \{ {{y+17+y=7} \atop {x=y+17}} \right.

\left \{ {{2y=-17+7} \atop {x=y+17}} \right.

\left \{ {{2y=-10} \atop {x=y+17}} \right.

\left \{ {{y=-5} \atop {x=y+17}} \right.

\left \{ {{y=-5} \atop {x=-5+17}} \right.

\left \{ {{y=-5} \atop {x=12}} \right.

Вiдповiдь:   {12;    -5)

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