Решите систему 2x-y=9 2y+x=-3. Created by alexooooon. algebra-ru

Решите систему 2x-y=9 2y+x=-3...

July 2022 1 21 Report

Решите систему
2x-y=9
2y+x=-3

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Apofeoz $\left \{ {{2x-y=9} \atop {2y+x=-3}} \right,\\\\1)\ 2x-y=9,\\y=2x-9;\\\\2)\ 2y+x=-3,\\2\bullet(2x-9)+x=-3,\\4x-18+x=-3,\\5x=15,\\x=3;\\\\3)\ y=2\bullet3-9=-3.$

Ответ: $x=3,\ y=-3.$

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