x+y =-6    czyli y = -6-x po drugie x^{2} + y[latex] x^{2} [/latex] = 116 x^{2} + (-6-x)^{2} = 116

x^2+(-6-x)^2=116 x^2+(36+12x+x^2)=116 2x^2+12x+36=116 2x^2+12x-80=0   /:2 x^2+6x-40=0 x^2+10x-4x-40=0 x(x+10)-4(x+10)=0 (x-4)(x+10)=0 x=4 lub x= -10 y= -6-4= -10  lub y= -6-(-10)=4