document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=141884>Question 141884</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Is this a function?\r<BR>\n" );
document.write( "\n" );
document.write( "x + y = 12\r<BR>\n" );
document.write( "\n" );
document.write( "a. yes<BR>\n" );
document.write( "b. no<BR>\n" );
document.write( "c. It depends<BR>\n" );
document.write( "d.  None of the above\r<BR>\n" );
document.write( "\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 #104098 by </B><A HREF=/tutors/aboutme.mpl?userid=nabla><B>nabla(475)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nabla><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=104098\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Recall that a function assigns a y-value for every x-value. However, x-values can not be paired with multiple y values. That is the tool we utilize when using the vertical line test. Can you draw a vertical line through any/every place on the graph and not have it cross more than once?\r<BR>\n" );
document.write( "\n" );
document.write( "In any case, your equation here can be rewritten as a function y(x):\r<BR>\n" );
document.write( "\n" );
document.write( "y=12-x<BR>\n" );
document.write( "y(x)=12-x\r<BR>\n" );
document.write( "\n" );
document.write( "It is clearly a function. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );