document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=786176>Question 786176</A>: <I><SPAN STYLE=\"word-break: break-all;\"> After driving 126mi, Syd found that the drive would have taken 1 hr. less time by increasing the speed by 8 mph. What was the actual speed? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #477832 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=477832\">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=+d+=+r%2At+ ALIGN=MIDDLE  ALT=\"+d+=+r%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "In the actual case:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+126+=+r%2At+ ALIGN=MIDDLE  ALT=\"+126+=+r%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "In the other case:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+126+=+%28+r%2B8+%29%2A%28+t-1+%29+ ALIGN=MIDDLE  ALT=\"+126+=+%28+r%2B8+%29%2A%28+t-1+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+126+=+r%2At+%2B+8t+-+r+-+8+ ALIGN=MIDDLE  ALT=\"+126+=+r%2At+%2B+8t+-+r+-+8+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+126+=+r%2A%28+t-1+%29+%2B+8t+-+8+ ALIGN=MIDDLE  ALT=\"+126+=+r%2A%28+t-1+%29+%2B+8t+-+8+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "By substitution:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+126+=+%28+126%2Ft+%29%2A%28+t-1+%29+%2B+8t+-+8+ ALIGN=MIDDLE  ALT=\"+126+=+%28+126%2Ft+%29%2A%28+t-1+%29+%2B+8t+-+8+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply both sides by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+ ALIGN=MIDDLE  ALT=\"+t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+126t+=+126%2A%28+t-1+%29+%2B+8t%5E2+-+8t+ ALIGN=MIDDLE  ALT=\"+126t+=+126%2A%28+t-1+%29+%2B+8t%5E2+-+8t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+126t+=+126t+-+126+%2B+8t%5E2+-+8t+ ALIGN=MIDDLE  ALT=\"+126t+=+126t+-+126+%2B+8t%5E2+-+8t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8t%5E2+-+8t+-+126+=+0+ ALIGN=MIDDLE  ALT=\"+8t%5E2+-+8t+-+126+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+4t%5E2+-+4t+-+63+=+0+ ALIGN=MIDDLE  ALT=\"+4t%5E2+-+4t+-+63+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Use quadratic formula<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"+t+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+a+=+4+ ALIGN=MIDDLE  ALT=\"+a+=+4+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+b+=+-4+ ALIGN=MIDDLE  ALT=\"+b+=+-4+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+c+=+-63+ ALIGN=MIDDLE  ALT=\"+c+=+-63+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+%28-%28-4%29+%2B-+sqrt%28+%28-4%29%5E2-4%2A4%2A%28-63%29+%29%29%2F%282%2A4%29+ ALIGN=MIDDLE  ALT=\"+t+=+%28-%28-4%29+%2B-+sqrt%28+%28-4%29%5E2-4%2A4%2A%28-63%29+%29%29%2F%282%2A4%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+%28+4+%2B-+sqrt%28+16+%2B+1008+%29%29%2F8+ ALIGN=MIDDLE  ALT=\"+t+=+%28+4+%2B-+sqrt%28+16+%2B+1008+%29%29%2F8+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+%28+4+%2B-+sqrt%28+1024+%29%29%2F8+ ALIGN=MIDDLE  ALT=\"+t+=+%28+4+%2B-+sqrt%28+1024+%29%29%2F8+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+%28+4+%2B+32+%29+%2F+8+ ALIGN=MIDDLE  ALT=\"+t+=+%28+4+%2B+32+%29+%2F+8+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+36%2F8+ ALIGN=MIDDLE  ALT=\"+t+=+36%2F8+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+4.5+ ALIGN=MIDDLE  ALT=\"+t+=+4.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and, since<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+126+=+r%2At+ ALIGN=MIDDLE  ALT=\"+126+=+r%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+126+=+r%2A4.5+ ALIGN=MIDDLE  ALT=\"+126+=+r%2A4.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+r+=+126%2F4.5+ ALIGN=MIDDLE  ALT=\"+r+=+126%2F4.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+r+=+28+ ALIGN=MIDDLE  ALT=\"+r+=+28+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The actual speed was 28 mi/hr<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+126+=+%28+r%2B8+%29%2A%28+t-1+%29+ ALIGN=MIDDLE  ALT=\"+126+=+%28+r%2B8+%29%2A%28+t-1+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+126+=+%28+28%2B8+%29%2A%28+4.5-1+%29+ ALIGN=MIDDLE  ALT=\"+126+=+%28+28%2B8+%29%2A%28+4.5-1+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+126+=+36%2A3.5+ ALIGN=MIDDLE  ALT=\"+126+=+36%2A3.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+126+=+126+ ALIGN=MIDDLE  ALT=\"+126+=+126+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );