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ddokanova
@ddokanova
May 2023
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3. Решить систему способом подстановки: 3х + y = 7, 9x — 4 y = -7.
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yikishima
y=7-3x
9x-4•(7-3x)=-7
9x-28+12x=-7
9x-12x=-7+28
9x+12x=-21
-21x=21
x=1.
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Answers & Comments
9x-4•(7-3x)=-7
9x-28+12x=-7
9x-12x=-7+28
9x+12x=-21
-21x=21
x=1.