document.write( "Question 188090: which of the following relations is a function?
\n" ); document.write( "{(-9,5),(7,1),(0,-8),(1,7)}
\n" ); document.write( "{(-9,5),(0,1),(4,-8),(4,7)}
\n" ); document.write( "{(-9,5),(0,1),(6,-8),(0,7)}
\n" ); document.write( "{(-9,5),(7,1),(0,-8),(7,3)}
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Algebra.Com's Answer #141005 by Mathtut(3670)\"\" \"About 
You can put this solution on YOUR website!
{(-9,5),(7,1),(0,-8),(1,7)}
\n" ); document.write( ":
\n" ); document.write( "all other answers have 2 values of y for one given x....example
\n" ); document.write( "is the 2nd set (4,-8) and (4,7)
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