document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=69671>Question 69671</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose that the relationship between te tempeature t of a cup of water (in degrees fahrenheit) and the number of seconds s that is in themicrowave is given by linear equation.  If initially, the temperature is 60 degrees fahrenheit, and after 120 seconds it has risen to 200 degrees fahrnheit:\r<BR>\n" );
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document.write( "1) What would the temperature be after 30 seconds?<BR>\n" );
document.write( "2) How long would youhave to leave it in for the temperature to reach 300 degrees fahrenheit? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #49624 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=49624\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Suppose that the relationship between te tempeature t of a cup of water (in degrees fahrenheit) and the number of seconds s that is in themicrowave is given by linear equation.  If initially, the temperature is 60 degrees fahrenheit, and after 120 seconds it has risen to 200 degrees fahrnheit:<BR>\n" );
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document.write( "You are given two \"points\" relating time and temperature: (0,60), (120,200)<BR>\n" );
document.write( "From these you can form an equation:<BR>\n" );
document.write( "slope = [200-60]/[120-0]= 140/120=7/6<BR>\n" );
document.write( "y-60=(7/6)(x-0)<BR>\n" );
document.write( "y=(7/6)x+60<BR>\n" );
document.write( "Y is temperature and x is time.\r<BR>\n" );
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document.write( "1) What would the temperature be after 30 seconds?<BR>\n" );
document.write( "temp = (7/6)(30)+60 = 95 degrees<BR>\n" );
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document.write( "2) How long would you have to leave it in for the temperature to reach 300 degrees fahrenheit<BR>\n" );
document.write( "300=(7/6)x+60<BR>\n" );
document.write( "240=(7/6)x<BR>\n" );
document.write( "x=(6/7)240<BR>\n" );
document.write( "time= 205.71 seconds<BR>\n" );
document.write( "--------<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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