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P12345p
@P12345p
July 2022
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Решите систему уравнений
1) 7х+у=20. 2) 3х+7у=-5. 3) 2-4у=3(х-2)
Х-5у=8 5х+4у=7. 2(х+у)=5у+2,5
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andrianabyblyk
1) 7х+у=20
7x=20-y
x=20/7 -y :7
x=20/7 - y/7
2) 3х+7у=-5
3x=-5-7y
x=- 5/3 - 7/3y
3) 2-4у=3(х-2)
2-4y=3x-6
-4y=3x-6-2
-4y=3x-8
y=-3/4 x +2
2(х+у)=5у+2,5
2x+2y=5y+2.5
2x=5y+2.5-2y
2x=3y+2.5
x=3/2 y +1.25
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Answers & Comments
7x=20-y
x=20/7 -y :7
x=20/7 - y/7
2) 3х+7у=-5
3x=-5-7y
x=- 5/3 - 7/3y
3) 2-4у=3(х-2)
2-4y=3x-6
-4y=3x-6-2
-4y=3x-8
y=-3/4 x +2
2(х+у)=5у+2,5
2x+2y=5y+2.5
2x=5y+2.5-2y
2x=3y+2.5
x=3/2 y +1.25