помогите решить систему уравнений методом подстановки

1)4х-3у=-1

х-5у=4 

 

2) 2х-5у=-7

х-3у=-5 

 

3) 2х+3у=3

5х+6у=9

 

4) 3х+2у=8

2х+6у=10

 

5)х-у=7

ху=-10

 

6)х-у=7

ху=-12

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