document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=309719>Question 309719</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A gas stattion sells 4820 gallons of gas on a day when they charge $1.35 per gallon, and they sell 3880 gallons on a day when they charge $1.40. Find the equation for the line whose graph depicts this data. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #221520 by </B><A HREF=/tutors/aboutme.mpl?userid=alicealc><B>alicealc(293)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=alicealc><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=221520\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> price = x<BR>\n" );
document.write( "number of gallons sold = y<BR>\n" );
document.write( "y = ax + b<BR>\n" );
document.write( "(1) 4820 = 1.35a + b<BR>\n" );
document.write( "(2) 3880 = 1.40a + b<BR>\n" );
document.write( "--------------------- (-)<BR>\n" );
document.write( "   940 = -0.05a<BR>\n" );
document.write( "a = 940/-0.05<BR>\n" );
document.write( "a = 94000/-5 = -18800\r<BR>\n" );
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document.write( "4820 = 1.35a + b<BR>\n" );
document.write( "4820 = 1.35*(-18800) + b<BR>\n" );
document.write( "4820 = -25380 + b<BR>\n" );
document.write( "b = 4820 + 25380 = 30200\r<BR>\n" );
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document.write( "so, the line equation for the problem is: y = -18800x + 30200<BR>\n" );
document.write( " </SPAN>\n" );
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