document.write( "Question 675405: is x^2+y^2=64 a function? \n" ); document.write( "
Algebra.Com's Answer #419813 by jim_thompson5910(35256)\"\" \"About 
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No it is not because solving for y gives you \"y+=+sqrt%2864-x%5E2%29\" or \"y+=+-sqrt%2864-x%5E2%29\" which both fail the vertical line test (if you plot them both at the same time). \n" ); document.write( "
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