document.write( "Question 706938: How can I tell if a graph is a function or not? \n" ); document.write( "

Algebra.Com's Answer #435433 by Edwin McCravy(20064) $\"\"$ $\"About$

You can put this solution on YOUR website!
All these amount to the same thing:
\n" ); document.write( "
\n" ); document.write( "1. There can be no vertical line that crosses the graph of a function twice.
\n" ); document.write( "2. The graph of a function cannot have two points with the same x-coordinate.
\n" ); document.write( "3. The graph of a function cannot pass above itself.
\n" ); document.write( "4. The graph of a function cannot pass below itself.
\n" ); document.write( "5. The graph of a function cannot have two points one directly above the other.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );