document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1135672>Question 1135672</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, 1), (-1, 4), (-4, 1), (1, -5)\r<BR>\n" );
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document.write( "  B. <BR>\n" );
document.write( "(-4, 1), (-1, 4), (1, -5), (-1, 6)\r<BR>\n" );
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document.write( "  C. <BR>\n" );
document.write( "(-4, 1), (-1, -5), (1, 5), (7, 1)\r<BR>\n" );
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document.write( "  D. <BR>\n" );
document.write( "(-4, 4), (-1, 6), (-4, 3), (7, 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 #753314 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=753314\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "Find the answer yourself; you won't learn anything by having us give you the answer.<br><BR>\n" );
document.write( "A relation defined by a set of ordered (x,y) pairs is a function if there are not two different y values for the same x value.<br><BR>\n" );
document.write( "I'll get you started: Answer A is NOT a function, because the two pairs (1,1) and (1,-5) have two different y values for the same x value.<br><BR>\n" );
document.write( "Two of the other three answer choices have the same thing that makes them NOT functions.  There is only one where that kind of thing does not occur; that one is the function. </SPAN>\n" );
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