document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=920417>Question 920417</A>: <I><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "5. SALES TAX Amelia received a gift card to a local music shop for her birthday. She plans to use the gift card to buy some new CDs.\r<BR>\n" );
document.write( "\n" );
document.write( "	a. Amelia chose 3 CDs that each cost $16. The sales tax on the three CDs is $3.96. Write a direct variation equation relating sales tax to the price.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "	b. Graph the equation you wrote in part a.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "c. What is the sales tax rate that Amelia is paying on  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #558344 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=558344\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> direct variation equation is y = kx<BR>\n" );
document.write( "k is the constant of variation.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "amelia bought 3 cds at 16 apiece for a total of 48 dollars.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "the tax was 3.96.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "the direct variation equation of y = kx becomes 3.96 = k * 48\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "solve for k to get k = 3.96 / 48 which is equal to .0825.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "the direct variation equation of y = kx becomes y = .0825 * x\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "that is the equation that you graph.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "the graph of that equation is shown below along with the value of y when x = 48.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "the value of y = 3.96 as it should be.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" src = \"http://theo.x10hosting.com/2014/1105_0001.jpg\" alt=\"$$$\" </>\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );