Mathematics: 21x + 7y = 14 -7y = 10 - 3x btw its Elimination!

21x + 7y = 14 -7y = 10 - 3x btw its Elimination! - id21714710315307619, bhhzd7499

Ответ:

cathyfrawley

17.02.2022

$\displaystyle\\\left \{ {{21x+7y=14} \atop {-7y=10-3x}} \right. \\\left \{ {{21x+7y=14} \atop {3x-7y=10}} \right. \\\\\text{We add 2 equations to remove y}\\21x+3x+7y+(-7y)=14+10\\24x=24=x=1\\\text{We found x, now we can find y. Let's put x=1 into 1st equation}\\21\times1+7y=14\\7y=-7\\y=-1$

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Ответ:

Nathaliasmiles

11.04.2022

Mathematics

Ahajshejehsjjwhwjwu

The first one!!!

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21x + 7y = 14
-7y = 10 - 3x
btw its Elimination!

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