document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=86888>Question 86888</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0395977223/algebrahomeworkh>algebra structure and method</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Erin's age is 3 times Warren's.   In 4 years she will be twice as old as he will be. How old is each now?<BR>\n" );
document.write( " How would you make an equation out of this?<BR>\n" );
document.write( "and check it?<BR>\n" );
document.write( " Please help!!! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #62836 by </B><A HREF=/tutors/aboutme.mpl?userid=tutor_paul><B>tutor_paul(519)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=tutor_paul><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=tutor_paul><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=62836\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You can make 2 equations out of this based on the information given. The first equation is derived from the fact that right now, Erin is 3 times older than Warren. Let E=Erin's age this year, and W=Warren's age this year:<BR>\n" );
document.write( "Equation #1: E=3W<BR>\n" );
document.write( "The next equation is developed from the fact that in 4 years, Erin will be twice the age of Warren. Using the same variables, you can write:<BR>\n" );
document.write( "Equation #2: E+4=2(W+4)<BR>\n" );
document.write( "Now that you have 2 equations and 2 unknowns, you can solve this problem!<BR>\n" );
document.write( "Substitute the value of E from Equation #1 into Equation #2 and solve for W:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3W%2B4=2%28W%2B4%29 ALIGN=MIDDLE  ALT=\"3W%2B4=2%28W%2B4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3W%2B4=2W%2B8 ALIGN=MIDDLE  ALT=\"3W%2B4=2W%2B8\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=W%2B4=8 ALIGN=MIDDLE  ALT=\"W%2B4=8\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28W=4%29 ALIGN=MIDDLE  ALT=\"highlight%28W=4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now, substitute this value of W into Equation #1 to find Erin's age:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=E=3%2A4 ALIGN=MIDDLE  ALT=\"E=3%2A4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28E=12%29 ALIGN=MIDDLE  ALT=\"highlight%28E=12%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Good Luck,<BR>\n" );
document.write( "tutor_paul@yahoo.com </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );