Question

помогите 2(х+2у)-7у=6     5(2х+у)-х=2у+60

Answer 1

2X + 4Y - 7Y = 6 ---> 2X - 3Y = 6 ---> 3Y = 2X - 6 

10X + 5Y - X = 2Y + 60 ---> 9X + 5Y = 2Y + 60 ---> 3Y = - 9X + 60

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2X - 6 = - 9X + 60 

11X = 66 

X = 6 

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3Y = 12 - 6 --> 3Y = 6 ---> Y = 2 

Ответ ( 6 ; 2 )