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Determine whether each relation is a function. In addition, provide reasons for identifying a relation as a function.
\n" ); document.write( "{(3, 4), (5, 9), (9, 9), (2, 3)}
\n" ); document.write( "{(0, 0), (0, 1), (1, 4), (2, 4)}
\n" ); document.write( "{(2, 1), (4, 5), (8, 4), (1, 0)}
\n" ); document.write( "{(8, 3), (8, 0), (7, 7), (4, 7)}\r
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document.write( "Rule: A function is a relation in which NO two ordered pairs \r\n" );
document.write( "have the same first coordinate. (It can, however, have two \r\n" );
document.write( "ordered pairs with the same second coordinate.)\r\n" );
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document.write( "{(3, 4), (5, 9), (9, 9), (2, 3)}\r\n" );
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document.write( "IS A FUNCTION because none of the four ordered pairs have\r\n" );
document.write( "the same first coordinate. (It is OK that the middle two\r\n" );
document.write( "ordered pairs have the same second coordinate).\r\n" );
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document.write( " {(0, 0), (0, 1), (1, 4), (2, 4)} \r\n" );
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document.write( "IS NOT A FUNCTION because the first two ordered pairs \r\n" );
document.write( "have the same first coordinate, namely 0.\r\n" );
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document.write( "{(2, 1), (4, 5), (8, 4), (1, 0)} \r\n" );
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document.write( "IS A FUNCTION because none of the four ordered pairs have\r\n" );
document.write( "the same first coordinates. \r\n" );
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document.write( "{(8, 3), (8, 0), (7, 7), (4, 7)}\r\n" );
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document.write( "IS NOT A FUNCTION because the first two ordered pairs \r\n" );
document.write( "have the same first coordinate, namely 8.\r\n" );
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document.write( "Edwin \n" );
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