Решите систему уравнений: 4х^2-ху=21 6х-у=17

y=6x-17                        y=6x-17 4x²-x(6x-17)=21           4x²-6x²+17x-21=0       -2x²+17x-21=0      D=17²-4*(-2)*(-21)=121=11²                                                        x=(-17+11)/-4=3/2      x=(-17-11)/-4=7                                                        y=6x-17=9-17=-8     y=42-17=25

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