document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1165846>Question 1165846</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Andrea ran and biked for a total of 32 miles in 4 hours. Her average running speed was 5 mph and her average biking speed was 13 mph.<BR>\n" );
document.write( "Let x= total hours Andrea ran<BR>\n" );
document.write( "Let y= total hours Andrea bikes<BR>\n" );
document.write( "Use substitution to solve for x and y. <BR>\n" );
document.write( "a) How many hours did Andrea run?<BR>\n" );
document.write( "b) how many hours did Andrea bike? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #790324 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=790324\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> so total distance on bike was 13y miles<BR>\n" );
document.write( "and running is 5x miles<BR>\n" );
document.write( "5x+13y=32<BR>\n" );
document.write( "x+y=4, so x=4-y<BR>\n" );
document.write( "5(4-y)+13y=32<BR>\n" );
document.write( "20-5y+13y=32<BR>\n" );
document.write( "8y=12<BR>\n" );
document.write( "y=1.5 hours on the bike or 19.5 miles<BR>\n" );
document.write( "x=2.5 hours running or 12.5 miles </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );