92719 mk nhanh nhất hãy ủng hộ mk nhé

1- Nam is too young , so he can’t take part in training to become an astronaut.

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2- He doesn’t take any exercise ; that’s why he is so unhealthy.

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3- We haven’t got any match , so we can’t light a fire.

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4- He doesn’t help me , possibly because I never ask him for help.

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5- I don’t know his address , so I can’t write to him.

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6- You work too fast ; that’s why you make so many mistakes.

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7- I haven’t got a map , so I can’t direct you.

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8- English people speak very quickly . Perhaps that’s why I can’t understand them.

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9- I live near my office , so I don’t spend much time traveling to work.

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10- Tom is fat ; that’s why he can’t get through the bathroom window.

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xy+3x-7y=21

xy-3x=21+7y

x(y-3)=7(3y)

=>x/7=3+y/y-3=y+3/y-3

=>7=y-3

y=7+3=10

=>x=10+3

x=13

vậy x=13 ; y=10

tick nha