document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=269775>Question 269775</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Mrs. Johnson is 3 times as old as her son. Ten years ago she was 5 times as old as her son was then. Find each of their ages. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #197660 by </B><A HREF=/tutors/aboutme.mpl?userid=Stitch><B>Stitch(470)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Stitch><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=197660\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Set Up:<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "Let Mrs. Johson's age = A<BR>\n" );
document.write( "Let the son's age = B\r<BR>\n" );
document.write( "\n" );
document.write( "Equation 1: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+3B ALIGN=MIDDLE  ALT=\"A+=+3B\"   DISABLED_style= \"max-width:90%; height:auto;\" > (She is tree times as old as here son)<BR>\n" );
document.write( "Equation 2: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+-+10+=+5%2A%28B+-+10%29 ALIGN=MIDDLE  ALT=\"A+-+10+=+5%2A%28B+-+10%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > (She was 5 times as old 10 years ago)\r<BR>\n" );
document.write( "\n" );
document.write( "Solution:<BR>\n" );
document.write( "------------<BR>\n" );
document.write( "We can substitute 3B into equation 2 for A<BR>\n" );
document.write( "Equation 2: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+-+10+=+5%2A%28B+-+10%29 ALIGN=MIDDLE  ALT=\"A+-+10+=+5%2A%28B+-+10%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%283B%29+-+10+=+5%2A%28B+-+10%29 ALIGN=MIDDLE  ALT=\"%283B%29+-+10+=+5%2A%28B+-+10%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Simplify<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3B+-+10+=+5B+-+50 ALIGN=MIDDLE  ALT=\"3B+-+10+=+5B+-+50\"   DISABLED_style= \"max-width:90%; height:auto;\" > Subtract 3B from both sides<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-10+=+5B+-+50+-+3B ALIGN=MIDDLE  ALT=\"-10+=+5B+-+50+-+3B\"   DISABLED_style= \"max-width:90%; height:auto;\" > Add 50 to both sides<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=50+-+10+=+5B+-+3B ALIGN=MIDDLE  ALT=\"50+-+10+=+5B+-+3B\"   DISABLED_style= \"max-width:90%; height:auto;\" > Simplify<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=40+=+2B ALIGN=MIDDLE  ALT=\"40+=+2B\"   DISABLED_style= \"max-width:90%; height:auto;\" > Divide both sides by 2<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%2820+=+b%29 ALIGN=MIDDLE  ALT=\"highlight%2820+=+b%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "Now we can plug 20 into equation 1 for B<BR>\n" );
document.write( "Equation 1: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+3B ALIGN=MIDDLE  ALT=\"A+=+3B\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+3%2A%2820%29 ALIGN=MIDDLE  ALT=\"A+=+3%2A%2820%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28A+=+60%29 ALIGN=MIDDLE  ALT=\"highlight%28A+=+60%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "Check you Answers<BR>\n" );
document.write( "-----------------<BR>\n" );
document.write( "Plug you values back into both equations to check them<BR>\n" );
document.write( "Equation 1: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+3B ALIGN=MIDDLE  ALT=\"A+=+3B\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=60+=+3%2A%2820%29 ALIGN=MIDDLE  ALT=\"60+=+3%2A%2820%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%2860+=+60%29 ALIGN=MIDDLE  ALT=\"highlight%2860+=+60%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Equation 2: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+-+10+=+5%2A%28B+-+10%29 ALIGN=MIDDLE  ALT=\"A+-+10+=+5%2A%28B+-+10%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=60+-+10+=+5%2A%2820+-+10%29 ALIGN=MIDDLE  ALT=\"60+-+10+=+5%2A%2820+-+10%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%2850+=+50%29 ALIGN=MIDDLE  ALT=\"highlight%2850+=+50%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );