document.write( "Question 111422: Indicate yes or no if the following are functions?
\n" ); document.write( "1. y=x^3
\n" ); document.write( "2. y=x^2-1
\n" ); document.write( "3. y=5
\n" ); document.write( "4. y=x^4 \n" ); document.write( "

Algebra.Com's Answer #81258 by jim_thompson5910(35256) $\"\"$ $\"About$

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If you graph all of these equations, you will notice that none of them fail the vertical line test. So that means they are all functions. \n" ); document.write( "

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