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$�� 5.7. �� :�) {x+y=-2, x^2+2xy+y^2=1-xy};�) {2x-y=3, 4x^2-4xy+y^2=2x+3y};�) {3x+2y=7, 9x^2+12xy+4y^2=9x+20y};�)...$

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5.7. �� :

�) {x+y=-2, x^2+2xy+y^2=1-xy};

�) {2x-y=3, 4x^2-4xy+y^2=2x+3y};

�) {3x+2y=7, 9x^2+12xy+4y^2=9x+20y};

�) {x^2-6xy+9y^2=x-y, x-3y=-1};

�) {x+2y=2, x^2+4xy+4y^2=2y+4x};

�) {2x-3y=1, 4x^2-12xy+9y^2=3x-5y}.

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