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$�� 5.3. �� :�) {2x^2+y^2=19, y-2x=5}; �) {x^2-y^2=45, x-2y=3};�) {x^2+3xy+y^2=-1, x+2y=0}; �) {x^2+xy-y^2=20, x-2y=0};�)...$

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5.3. �� :

�) {2x^2+y^2=19, y-2x=5}; �) {x^2-y^2=45, x-2y=3};

�) {x^2+3xy+y^2=-1, x+2y=0}; �) {x^2+xy-y^2=20, x-2y=0};

�) {xy+y^2+x-3y=8, x+y=6}; �) {x^2-xy-x+2y=22, x-y=3}.

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