x²+y²=5; x-y=1 в фигурных скобках

x^2+y^2=5x-y=1x=y+1(y+1)^2+y^2=5(y+1)(y+1)=y^2+y+y+1=y^2+2y+1y^2+2y+1+y^2=52y^2+2y-4=0 |:2y^2+y-2=0D=1-4*(-2)*1=9y_{1,2}=(-1+/-3)/2y_1 = 1 ; y_2 = -2x=1+1x=2x=-2+1x=-1(y=1;x=2) (y=-2; x = -1)