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8. �) {y=3, x^2-6y+8=0}; �) {y>=3, y-x+1=0};

�) {x=2, y^2-8y+15=0}; �) {y<=5, y-x+1>=0};

�) {x>=2, 3<=y<=5}; �) {x>=2, 3<=y<=5, 3y+4x<=22}.

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