document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1195906>Question 1195906</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A student bought a calculator and a textbook for a course in algebra. He told his friend that the total cost was $160 (without tax) and that the calculator cost $20 more than four times the cost of the textbook. What was the cost of each item </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #828526 by </B><A HREF=/tutors/aboutme.mpl?userid=math_tutor2020><B>math_tutor2020(3817)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=math_tutor2020><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=828526\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <font color=black size=3><BR>\n" );
document.write( "x = cost of the textbook<BR>\n" );
document.write( "4x = four times the cost of the textbook<BR>\n" );
document.write( "4x+20 = twenty more dollars added to the previous amount<BR>\n" );
document.write( "4x+20 = cost of the calculator\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "The textbook costs x dollars.<BR>\n" );
document.write( "The calculator costs 4x+20 dollars.<BR>\n" );
document.write( "These two items add to a total cost of $160 before tax.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "textbook + calculator = total<BR>\n" );
document.write( "(x) + (4x+20) = 160<BR>\n" );
document.write( "5x+20 = 160<BR>\n" );
document.write( "5x = 160-20<BR>\n" );
document.write( "5x = 140<BR>\n" );
document.write( "x = 140/5<BR>\n" );
document.write( "x = 28<BR>\n" );
document.write( "The textbook costs $28\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "4x+20 = 4*28+20 = 112+20 = 132<BR>\n" );
document.write( "The calculator costs $132\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "The total cost is 28+132 = 160 to confirm our answers.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<font color=red>Answers:<BR>\n" );
document.write( "textbook = $28<BR>\n" );
document.write( "calculator = $132</font>\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Side note: Desmos and GeoGebra are free online calculators that have far more features than anything a TI83 or TI84 can do. Also, they are much faster. The only drawback is that in formal test environments (eg: SATs), such online calculators are not allowed. <BR>\n" );
document.write( "</font> </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );