Решите уравнение методом алебраичекого сложения x^2-y^2=4 и 2x^2+y^2=104

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[latex] \left \{ {{ x^{2} -y^{2}=4 } \atop {2 x^{2} + y^{2} =104}} \right. + \left \{ {{ x^{2} - y^{2} =4} \atop {3 x^{2} =108}} \right. , \left \{ {{ x^{2} -y ^{2} =4} \atop { x^{2} =36}} \right. [/latex] [latex] \left \{ {{x=-6} \atop {(-6) ^{2} -y^{2}=4 }} \right. , \left \{ {{x=-6} \atop { y^{2} =32}} \right. \left \{ {{x=-6} \atop {y=4 \sqrt{2} }} \right. \left \{ {{x=-6} \atop {y=-4 \sqrt{2} }} \right. [/latex] [latex] \left \{ {{x=6} \atop { y^{2} =32}} \right. [/latex] ответ: (-6; -4√2); (-6; 4√2);  (6; -4√2); (6; 4√2)