Решите систему координат методом подстановки:

а) { y=x^2, x-y=-6;

 

 

 

б) { x+y=8, xy=12;

 

 

 

в) {x^2-Y^2=24, 2y-x=-7;

 

 

г)  {x^2+y^2+3xy=-1, x+2y=0

 

 

 

 

 

 

 

 

 

 

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