document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1082104>Question 1082104</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The worldwide consumption of cigarettes has been increasing steadily in recent years. The number of trillions of cigarettes, y, purchased x years after 1960, is estimated by the linear equation \r<BR>\n" );
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document.write( "y= .075x+2.5\r<BR>\n" );
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document.write( "(a) sketch a graph of the linear equation<BR>\n" );
document.write( "(b) what interpretation can be given to the y-intercept of the graph?<BR>\n" );
document.write( "(c) When were there 4 trillion cigarettes sold?<BR>\n" );
document.write( "(d) If this trend continues, how many cigarettes will be sold in the year 2020?<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 #696194 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=696194\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28300%2C300%2C-10%2C65%2C-5%2C10%2C0.075x%2B2.5%29 ALIGN=MIDDLE  ALT=\"graph%28300%2C300%2C-10%2C65%2C-5%2C10%2C0.075x%2B2.5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The y-intercept represents consumption in 1960.<BR>\n" );
document.write( "4=.075x+2.5<BR>\n" );
document.write( "1.5=0.075x<BR>\n" );
document.write( "x=20, and that would be 1980.<BR>\n" );
document.write( "in 2020, x=60 and y=.075*60+2.5=4.5+2.5=7 trillion. </SPAN>\n" );
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