document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=930346>Question 930346</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose that the water depth in a leaking water tank changes at a constant rate. The water in the tank was 8 feet deep after leaking for 1 hour and was 6 feet deep after leaking for 3 hours.<BR>\n" );
document.write( "How many feet deep was the water when the tank first began to leak? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #564930 by </B><A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><B>TimothyLamb(4379)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><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=TimothyLamb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=564930\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> leak rate equation starting at 1-hour after leak began:<BR>\n" );
document.write( "x = hours<BR>\n" );
document.write( "y = feet<BR>\n" );
document.write( "y = mx + b<BR>\n" );
document.write( "---<BR>\n" );
document.write( "leak rate = m = slope = dy/dx<BR>\n" );
document.write( "leak rate = (8-6)/(3-1)<BR>\n" );
document.write( "leak rate = (2)/(2)<BR>\n" );
document.write( "leak rate = 1 ft/hour<BR>\n" );
document.write( "m = 1 ft/hour<BR>\n" );
document.write( "---<BR>\n" );
document.write( "y-intercept = b = water level 1-hour after leak began<BR>\n" );
document.write( "b = 8 ft<BR>\n" );
document.write( "---<BR>\n" );
document.write( "leak rate equation starting at 1-hour after leak began:<BR>\n" );
document.write( "y = x + 8<BR>\n" );
document.write( "---<BR>\n" );
document.write( "water level when the tank first began to leak:<BR>\n" );
document.write( "y = x + 8<BR>\n" );
document.write( "y = (0 - 1) + 8<BR>\n" );
document.write( "y = -1 + 8<BR>\n" );
document.write( "y = 7 ft<BR>\n" );
document.write( "---<BR>\n" );
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document.write( "---<BR>\n" );
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document.write( "---<BR>\n" );
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document.write( "---<BR>\n" );
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document.write( "</TD></TR></TABLE>\n" );