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Citi050
@Citi050
July 2022
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решите систему уравнений
3х-7(у+1)=-8
х-у=1
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svetazuna
Из 2 уравнения найдем х:
х = 1+у.
подставим данное выражение в 1 уравнение:
3*(1+у) - 7(у+1)=-8,
(1+у)*(3-7) = -8,
(1+у)*(-4) = -8,
1+у = -8 : (-4) = 2,
у = 2-1,
у = 1,
х = 1+1 = 2
ответ: (2;1)
1 votes
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Answers & Comments
х = 1+у.
подставим данное выражение в 1 уравнение:
3*(1+у) - 7(у+1)=-8,
(1+у)*(3-7) = -8,
(1+у)*(-4) = -8,
1+у = -8 : (-4) = 2,
у = 2-1,
у = 1,
х = 1+1 = 2
ответ: (2;1)