document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1195917>Question 1195917</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Determine whether the relation is a function.<BR>\n" );
document.write( " t​{(4​,8​),(20,-9),(36​,8​),(4​,6​),(50​,​6)} </SPAN>\n" );
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document.write( "Answer: No, it is not a function.\r<BR>\n" );
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document.write( "Reason: <BR>\n" );
document.write( "The input x = 4 leads to multiple outputs (y = 8 and y = 6) at the same time. This is due to the points (4,8) and (4,6)<BR>\n" );
document.write( "For a function to be possible, any input must lead to exactly one and only one output. \r<BR>\n" );
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document.write( "A quick way to check if we have a function or not is to see if x repeats itself. <BR>\n" );
document.write( "If x repeats itself, then we don't have a function. <BR>\n" );
document.write( "The y values can repeat, but the function won't be one-to-one.<BR>\n" );
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