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lexa28062001
@lexa28062001
July 2022
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Решить систему уравнений
y-9x=13
3x+2y=5
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elina1sky
Y=13+9x3x+2 (13+9x)=5Y=13+9x3x+ 26 +18x=5Y=13+9x21x=-21Y=13+9xX=-1Y=4x=-1
2 votes
Thanks 3
Helix99
Y-9x=13 y=9x+13
3x+2y=5 3x+2y=5
Подставляем "у" из первого уравнения во второе:
3x+2*(9x+13)=5
3x+18x+26=5
21x=5-26
21x=-21
x=-1
1 votes
Thanks 9
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Answers & Comments
3x+2y=5 3x+2y=5
Подставляем "у" из первого уравнения во второе:
3x+2*(9x+13)=5
3x+18x+26=5
21x=5-26
21x=-21
x=-1