document.write( "Question 157669: Which one of these are functions?\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "1) x = 4\r
\n" ); document.write( "\n" ); document.write( "2) y = 2x + 5\r
\n" ); document.write( "\n" ); document.write( "3) y=x \n" ); document.write( "

Algebra.Com's Answer #116169 by oscargut(2103) $\"\"$ $\"About$

You can put this solution on YOUR website!
1) is not a function because the graph is avertical line
\n" ); document.write( "2) and 3) are functions because they are not vertical lines \n" ); document.write( "

\n" );