document.write( "Question 977407: determine whether Y is a function of X for x^2+y^2 =4 \n" ); document.write( "

Algebra.Com's Answer #598926 by Fombitz(32388) $\"\"$ $\"About$

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No, not a function.
\n" ); document.write( " $\"y%5E2=4-x%5E2\"$
\n" ); document.write( " $\"y=0+%2B-+sqrt%284-x%5E2%29\"$
\n" ); document.write( "So for any x value, you have two y values, which violates the definition of a function.
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