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Mathematics, 29.10.2020 21:50 kathyc53

{ ( 6 , − 5 ) , ( 7 , − 3 ) , ( 8 , − 1 ) , ( 9 , 1 ) } { ( 6 , - 5 ) , ( 7 , - 3 ) , ( 8 , - 1 ) , ( 9 , 1 ) } Is it a function ?

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{ ( 6 , − 5 ) , ( 7 , − 3 ) , ( 8 , − 1 ) , ( 9 , 1 ) } { ( 6 , - 5 ) , ( 7 , - 3 ) , ( 8 , - 1 ) ,...
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