November 2021 0 5 Report
Срочно!!! Даю 30 баллов Розв'язати систему рівнянь способом підстановки
1)y=5-x 2)y=7-x 3)2y+x=7.
2x-y=7 y-3x=-7 15y-2x=27
4)x+7y=9
5x+3y=7
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