document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=125156>Question 125156</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose you are starting an office cleaning service. You spent $315 on equipment. To clean an office you use $4 worth of supplies. You charge $25 per office. How many offices must you clean to break even?\r<BR>\n" );
document.write( "\n" );
document.write( "My Work\r<BR>\n" );
document.write( "\n" );
document.write( "x = supplies<BR>\n" );
document.write( "y = charge per office\r<BR>\n" );
document.write( "\n" );
document.write( "x + y = 315\r<BR>\n" );
document.write( "\n" );
document.write( "4x + 25y = 315\r<BR>\n" );
document.write( "\n" );
document.write( "-4(x + y = 315)\r<BR>\n" );
document.write( "\n" );
document.write( "-4x - 4y = -1260<BR>\n" );
document.write( "4x + 25y = 315\r<BR>\n" );
document.write( "\n" );
document.write( "21y = -4\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #91749 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=91749\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Suppose you are starting an office cleaning service. You spent $315 on equipment. To clean an office you use $4 worth of supplies. You charge $25 per office. How many offices must you clean to break even? <BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "Let \"x\" be the number of offices you clean.<BR>\n" );
document.write( "Expenses: 315+4x dollars<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "Income: 25x dollars<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "EQUATION:<BR>\n" );
document.write( "Break even means expenses = income<BR>\n" );
document.write( "315+4x = 25x<BR>\n" );
document.write( "21x = 315 <BR>\n" );
document.write( "x = 15 (# of offices you need to clean)<BR>\n" );
document.write( "=======================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );