document.write( "Question 78275:
\n" ); document.write( "D.(1,-4)(8,2)(7,1)(-4,7) \n" ); document.write( "
Algebra.Com's Answer #56180 by Edwin McCravy(20086)\"\" \"About 
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document.write( "Which of the following relations is NOT a function?\r\n" );
document.write( "A.(3,5)(4,9)(2,8)(1,7)\r\n" );
document.write( "B.(4,7)(5,9)(4,9)(2,8)\r\n" );
document.write( "C.(3,5)(4,5)(2,5)(1,5)\r\n" );
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document.write( "A function is a set of ordered pairs no two points\r\n" );
document.write( "of which have the same x-coordinate.  (Note, the\r\n" );
document.write( "y-coordinates of two points can be the same, but\r\n" );
document.write( "the x-coordinates cannot be.)\r\n" );
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document.write( "The correct choice is B because it contains two points\r\n" );
document.write( "(4,7) and (4,9) both of which have the same x-coordinate.\r\n" );
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document.write( "Edwin

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