document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=153398>Question 153398</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a car used 14 gal. of gas an traveled a total distance of 550 mi. the car's fuel efficiency is 40 mi./gal on the highway and 35 mi/gal in the city. how many gal of gasoline were used on the highway? \r<BR>\n" );
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document.write( "write linear equation and solve </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #112912 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=112912\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a car used 14 gal. of gas and traveled a total distance of 550 mi. the car's fuel efficiency is 40 mi./gal on the highway and 35 mi/gal in the city. how many gal of gasoline were used on the highway? <BR>\n" );
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document.write( "Let h be distance on highway ; Let c be distance in city.<BR>\n" );
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document.write( "EQUATIONS:<BR>\n" );
document.write( "distance equation: h + c = 550<BR>\n" );
document.write( "gas use equation : (h/40 + c/35) = 14<BR>\n" );
document.write( "Simplifying the 2nd equation:<BR>\n" );
document.write( "7h + 8c = 3920<BR>\n" );
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document.write( "EQUATIONS:<BR>\n" );
document.write( "h + c = 550<BR>\n" );
document.write( "7h+8c = 3920<BR>\n" );
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document.write( "Modify:<BR>\n" );
document.write( "8h + 8c = 4400<BR>\n" );
document.write( "7h + 8c = 3920<BR>\n" );
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document.write( "h = 480 miles (distance traveled on the highway)<BR>\n" );
document.write( "480/40 = 12 gallons (# of gallons of gas used in highway travel)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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