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Автор - rinalazygirl23

Решите систему уравнений:

{х^2+у^2=74
х-у=2​

Ответ

Автор - rubilovalex

Ответ: x=y+2.  подставляем в 1 уравнение: (y+2)^2+y^2=74; y^2+4y+4+y^2-74=0; 2y^2+4y-70=0; y^2+2y-35=0; D= 2^2-4*1*(-35)=4+140=144; y1=(-2-12)/2,y2=(-2+12)/2. y1= -7, y2=5. x1= -7+2= -5, x2=5+2=7. Ответ: ( -5; -7), (7 ; 5).

Объяснение:

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