document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1100088>Question 1100088</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Which of the following relations is a function?<BR>\n" );
document.write( "  A. <BR>\n" );
document.write( "(1, 4), (-2, 2), (9, 1), (-6, 2)\r<BR>\n" );
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document.write( "  B. <BR>\n" );
document.write( "(9, 1), (-2, 4), (1, 1), (9, 2)\r<BR>\n" );
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document.write( "  C. <BR>\n" );
document.write( "(1, 0), (-2, 3), (9, 1), (-2, 5)\r<BR>\n" );
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document.write( "  D. <BR>\n" );
document.write( "(1, 4), (-2, 6), (1, 3), (-6, 2)<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #714573 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=714573\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A function can't have two y values for the same x.<BR>\n" );
document.write( "Therefore, if x is different in each group it is a function<BR>\n" );
document.write( "BCD all have two with the same x (9, -2, 1 respectively)<BR>\n" );
document.write( "Therefore, A is a function.  No x has two y values. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );