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x=-2y1. ( , 0); 2. (9, ); 3. ( , -2); 1. (0, 0), as any number multiplied by 0 is 0.2. x=9, so 9=-2y, y=-4.5 - (9, -4.5)3. y=-2, so -2y=(-2)*(-2)=4=x - (4, -2)Solutions: (0, 0), (9, -4.5), (4, -2).