document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=592852>Question 592852</A>: <I><SPAN STYLE=\"word-break: break-all;\"> why isn't (1,3) (2,2) (1,5) (2,6) a function </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #376108 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=376108\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> why isn't (1,3) (2,2) (1,5) (2,6) a function<BR>\n" );
document.write( "For an expression to be a function, for each x there must only be only one y. <BR>\n" );
document.write( "You will note that for points (1,3) and (1,5), x has two different values y. <BR>\n" );
document.write( "Similarly, (2,2 and (2,6) show the same. Therefore, these points are not from a function.<BR>\n" );
document.write( "If you graph these points, you will get a curve similar to a parabola opening rightwards and it would fail the vertical line test which allows only one intersection for a function. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );