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basovkostya
@basovkostya
July 2022
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3y-x=4
2x-21y=2 решите подстановкой
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Poirtena
-x=4-3y умножаем на -1.
x=-4+3y
2•(-4+3y)-21=2
-8+6y-21=2
-8-21-2=-6y
-31=-6y
y=31÷6
y=Дробь ответ.
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Answers & Comments
x=-4+3y
2•(-4+3y)-21=2
-8+6y-21=2
-8-21-2=-6y
-31=-6y
y=31÷6
y=Дробь ответ.