document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1107385>Question 1107385</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Which equation is NOT a direct variation?<BR>\n" );
document.write( "A) y = 50x<BR>\n" );
document.write( "B) 5x + 2y= 10<BR>\n" );
document.write( "C) - 2y = x<BR>\n" );
document.write( "D) - 3x + 2y = 0 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #722469 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=722469\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a direct variation is of the form y = kx.\r<BR>\n" );
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document.write( "k is the constant of variation.\r<BR>\n" );
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document.write( "y = 50x is clearly a direct variation with k = 50.\r<BR>\n" );
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document.write( "2y = x looks like a direct variation because, when you solve for y, you get y = 1/2 * x, where k is equal to 1/2, so it fits the form of y = kx.\r<BR>\n" );
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document.write( "-3x + 2y = 0 leads to y = 3/2 * x, so it also fits the form of y = kx where k = 3/2.\r<BR>\n" );
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document.write( "that leaves 5x + 2y = 10 which has to be the answer.\r<BR>\n" );
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document.write( "solve for y to get y = (10 - 5x) / 2 which is equal to y = 5 - 5/2 * x which does not fit the form of y = kx.\r<BR>\n" );
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document.write( "so, i would say selection B is the one that is not a direct variation, because it doesn't fit the general form of a direct variation equation.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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