решите систему линейных уравненийспособом сложения

 

1)

2x-7y=8

x+3y=5

2)

3y-4x=8

y-5x=1

3)  

2x-5y=2

3x-11=5

4)

2y-8x=1

5y+7x=3

5)

3x-4y=5

x+5y=-2

6)

2y-8x=5

y-3x=9

 

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