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Кристина13411
@Кристина13411
August 2022
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Решите систему уравнений. 5х-9у=17 3х+7у=35}
Найдите значение выражения А=-2х+3у при полученных х и у
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andrisd
Verified answer
5x-9y=17
3x+7y=35
5x=17+9y
x=(17+9y)/5=9y/5+17/5
7y+3(9y/5+17/5)=35
62y/5+51/5=35
62y/5=124/5
310y=620
y=620/310=2
5x-9*2=17
5x-18=17
5x=17+18=35
x=35/5
x=7
x=7, y=2
A=-2x+3y
A=-2*7+3*2
A=-14+6
A=-8
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Answers & Comments
Verified answer
5x-9y=173x+7y=35
5x=17+9y
x=(17+9y)/5=9y/5+17/5
7y+3(9y/5+17/5)=35
62y/5+51/5=35
62y/5=124/5
310y=620
y=620/310=2
5x-9*2=17
5x-18=17
5x=17+18=35
x=35/5
x=7
x=7, y=2
A=-2x+3y
A=-2*7+3*2
A=-14+6
A=-8