Ответ: {y²+xy=12{3y-x=10х=(3у-10)у²+у(3у-10)=12у²+3у²-10у-12=04у²-10у-12=0D=(-(-10))²-4×4×(-12)=100+192=292y1=(-(-10)-√292)/2×4=(10-17,088)/8=-7,088/8=-0,886y2=(-(-10)+√292)/2×4=(10+17,088)/8=27,088/8=3,386×1=3y1-10×1=3×(-0,886)-10×1=-2,658-10×1=-12,658×2=3y2-10×2=3×3,386-10×2=10,158-10×2=0,158(-12,658;-0,886); (0,158;3,386).