document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1028199>Question 1028199</A>: <I><SPAN STYLE=\"word-break: break-all;\"> X+y2(squared)=4\r<BR>\n" );
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document.write( "Determine whether y is a function of x </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #643339 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=643339\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> y is not a function of x.\r<BR>\n" );
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document.write( "start with x + y^2 = 4\r<BR>\n" );
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document.write( "subtract x from both sides of the equation to get y^2 = 4-x\r<BR>\n" );
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document.write( "take the square root of both sides of the equation to get y = plus or minus sqrt(4-x).\r<BR>\n" );
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document.write( "you are getting 2 values of y for every value of x.\r<BR>\n" );
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document.write( "that means that y is not a function of x.\r<BR>\n" );
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document.write( "in order for it to be a function, you must get one and only one value of y for each and every value of x.\r<BR>\n" );
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