Решите систему уравнений: [latex] \left \{ {{3 x^{2}+y = 9 }, \atop {7 x^{2} -y=1}} \right. [/latex]

[latex] \left \{ {{y=9-3x ^{2} } \atop {7x ^{2}-(9-3 x^{2} )-1=0 }} \right. [/latex] [latex]7 x^{2} +3 x^{2} -10=0 10 x^{2} =10 x^{2} =1 \left \{ {{x=1} \atop {x=-1}} \right. [/latex] [latex] \left \{ {{y1=9-3=6} \atop {y2=9+3=12}} \right. [/latex] Ответ: x1=1;x2=-1;y1=6;y2=12