document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=141027>Question 141027</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0131469002/algebrahomeworkh>Intermediate Alebra A Graphing Approach</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Is there an easier way to phrase the instructions in book? I am not understanding the examples and phases in the book.After finding the domain and range, just how can you tell if it's a function or not. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #102766 by </B><A HREF=/tutors/aboutme.mpl?userid=vleith><B>vleith(2983)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=vleith><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=102766\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I do not have your book, but if you have found the domain and the range, then you can tell if the expression is a function by using the 'vertical line rule'. On a plot of the graph, if any vetical line intersects the graph in two places, that graph is not a function.\r<BR>\n" );
document.write( "\n" );
document.write( "In words, if any one value in the domain maps to more than one value in the range, it is not a function.\r<BR>\n" );
document.write( "\n" );
document.write( "Basically, a function uniquely maps a single value if X to a single value of Y. You can map many Xs to the same Y, but no single X can be mapped to two different Ys. \r<BR>\n" );
document.write( "\n" );
document.write( "I hope that helps </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );