document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=190549>Question 190549</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have a word problem that my professor wants me to use the straight line formula to do. I just can not figure out how to put the numbers in the right spot or what numbers to use!<BR>\n" );
document.write( "The problem is Sales, given in thousands, for a particular compan in 1990 were at 140.5 and in 2000 at 180.5. Estimate the sales for theyears 1997 and 2003. Let x=0 correspond to 1990. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #143017 by </B><A HREF=/tutors/aboutme.mpl?userid=jojo14344><B>jojo14344(1513)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jojo14344><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=143017\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <font face=\"Tahoma\" size=1.5><BR>\n" );
document.write( "</pre><font size=4><b><BR>\n" );
document.write( "Remember Problem # <font color=blue>189853?</font> It is the same as this one right?\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "You were just looking a straight Line formula, <font color=blue>Ax + By + C =0 </font> and we we'll get there. The double interpolation we did is also one way of doing it.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Let <font color=blue>x</font> = Year and <font color=blue>y</font> = Sales:\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "If x = 0 for year 1990, then y = 140.5. This makes our Line Eq'n,---> <font color=green>x + y =140.5</font>.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "If x = 10 for year 2000, then y = 180.5. This makes our Line Eqn, ---> <font color=red> -4x + y =140.5 </font>. Why?\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Let's substitute x=10:\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-4%2810%29+%2B+y+=140.5 ALIGN=MIDDLE  ALT=\"-4%2810%29+%2B+y+=140.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-40%2By=140.5 ALIGN=MIDDLE  ALT=\"-40%2By=140.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=140.5%2B40=red%28180.5%29 ALIGN=MIDDLE  ALT=\"y=140.5%2B40=red%28180.5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, correct.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Therefore, to find for Sales for the year 1997:\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "We use x=7 for year 1997:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-4%28highlight%287%29%29%2By=140.5 ALIGN=MIDDLE  ALT=\"-4%28highlight%287%29%29%2By=140.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-28%2By=140.5 ALIGN=MIDDLE  ALT=\"-28%2By=140.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=140.5%2B28=highlight%28red%28168.50%29%29 ALIGN=MIDDLE  ALT=\"y=140.5%2B28=highlight%28red%28168.50%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, Sales for 1997\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "To find Sales for 2003, we use x=13:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-4%28highlight%2813%29%29%2By=140.5 ALIGN=MIDDLE  ALT=\"-4%28highlight%2813%29%29%2By=140.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-52%2By=140.5 ALIGN=MIDDLE  ALT=\"-52%2By=140.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "y=140.5+52=192.50, Sales for 2003\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "See Problem 189853 again, the values are the same. There is a misprint but it was adjusted.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Your working Line Eqn, -4x + y =140.5 ( Answer )\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Thank you,<BR>\n" );
document.write( "Jojo </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );