document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1083313>Question 1083313</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please Help! I am new to this page I have been working on this question for a while and I can not figure it out.  \r<BR>\n" );
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document.write( "In 1993, the life expectancy of males in a certain country was 73.6 years. In 1998&#8203;, it was 77.2 years. Let E represent the life expectancy in year t and let t represent the number of years since 1993\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #697322 by </B><A HREF=/tutors/aboutme.mpl?userid=MathLover1><B>MathLover1(20849)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathLover1><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=MathLover1><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=697322\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> \r<BR>\n" );
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document.write( "In <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1993 ALIGN=MIDDLE  ALT=\"1993\"   DISABLED_style= \"max-width:90%; height:auto;\" >, the \"life expectancy of males in a certain country\" was <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=73.6 ALIGN=MIDDLE  ALT=\"73.6\"   DISABLED_style= \"max-width:90%; height:auto;\" > years.<BR>\n" );
document.write( "so, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=E=73.6 ALIGN=MIDDLE  ALT=\"E=73.6\"   DISABLED_style= \"max-width:90%; height:auto;\" > years and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=1993 ALIGN=MIDDLE  ALT=\"t=1993\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( " In <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1998 ALIGN=MIDDLE  ALT=\"1998\"   DISABLED_style= \"max-width:90%; height:auto;\" >&#8203;, it was <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=77.2 ALIGN=MIDDLE  ALT=\"77.2\"   DISABLED_style= \"max-width:90%; height:auto;\" > years, so \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=E=77.2 ALIGN=MIDDLE  ALT=\"E=77.2\"   DISABLED_style= \"max-width:90%; height:auto;\" > years and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=1998 ALIGN=MIDDLE  ALT=\"t=1998\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "The linear function <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=E%28t%29 ALIGN=MIDDLE  ALT=\"E%28t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > that fits the data is:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=E%28t%29=at+%2B+b ALIGN=MIDDLE  ALT=\"E%28t%29=at+%2B+b\"   DISABLED_style= \"max-width:90%; height:auto;\" >................use <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=E=73.6 ALIGN=MIDDLE  ALT=\"E=73.6\"   DISABLED_style= \"max-width:90%; height:auto;\" > years and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=1993 ALIGN=MIDDLE  ALT=\"t=1993\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=73.6=a%2A1993+%2B+b ALIGN=MIDDLE  ALT=\"73.6=a%2A1993+%2B+b\"   DISABLED_style= \"max-width:90%; height:auto;\" >....solve for <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b ALIGN=MIDDLE  ALT=\"b\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=73.6-a%2A1993 ALIGN=MIDDLE  ALT=\"b=73.6-a%2A1993\"   DISABLED_style= \"max-width:90%; height:auto;\" >.........eq.1\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=E%28t%29=at+%2B+b ALIGN=MIDDLE  ALT=\"E%28t%29=at+%2B+b\"   DISABLED_style= \"max-width:90%; height:auto;\" >................use <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=E=77.2 ALIGN=MIDDLE  ALT=\"E=77.2\"   DISABLED_style= \"max-width:90%; height:auto;\" > years and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=1998 ALIGN=MIDDLE  ALT=\"t=1998\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=77.2=a%2A1998+%2B+b ALIGN=MIDDLE  ALT=\"77.2=a%2A1998+%2B+b\"   DISABLED_style= \"max-width:90%; height:auto;\" >....solve for <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b ALIGN=MIDDLE  ALT=\"b\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=77.2-a%2A1998 ALIGN=MIDDLE  ALT=\"b=77.2-a%2A1998\"   DISABLED_style= \"max-width:90%; height:auto;\" >.........eq.2\r<BR>\n" );
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document.write( "from eq.1 and eq.2 we have\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=73.6-a%2A1993=+77.2-a%2A1998 ALIGN=MIDDLE  ALT=\"73.6-a%2A1993=+77.2-a%2A1998\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=73.6-77.2=a%2A1993-a%2A1998 ALIGN=MIDDLE  ALT=\"73.6-77.2=a%2A1993-a%2A1998\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-3.6=a%281993-1998%29 ALIGN=MIDDLE  ALT=\"-3.6=a%281993-1998%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-3.6=a%28-5%29 ALIGN=MIDDLE  ALT=\"-3.6=a%28-5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a=-3.6%2F%28-5%29 ALIGN=MIDDLE  ALT=\"a=-3.6%2F%28-5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a=+0.72 ALIGN=MIDDLE  ALT=\"a=+0.72\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "now find <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b ALIGN=MIDDLE  ALT=\"b\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=73.6-a%2A1993 ALIGN=MIDDLE  ALT=\"b=73.6-a%2A1993\"   DISABLED_style= \"max-width:90%; height:auto;\" >.........eq.1\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=73.6-0.72%2A1993 ALIGN=MIDDLE  ALT=\"b=73.6-0.72%2A1993\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=73.6-1434.96 ALIGN=MIDDLE  ALT=\"b=73.6-1434.96\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=-1361.36 ALIGN=MIDDLE  ALT=\"b=-1361.36\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "then, equation is:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=E%28t%29=at+%2B+b ALIGN=MIDDLE  ALT=\"E%28t%29=at+%2B+b\"   DISABLED_style= \"max-width:90%; height:auto;\" >...if <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a=+0.72 ALIGN=MIDDLE  ALT=\"a=+0.72\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=-1361.36 ALIGN=MIDDLE  ALT=\"b=-1361.36\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=E%28t%29=0.72t+-1361.36 ALIGN=MIDDLE  ALT=\"E%28t%29=0.72t+-1361.36\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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