document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=928673>Question 928673</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Teacher is throwing a party for students using $136. She plans on buying 5 Pizzas and 40 Drinks.<BR>\n" );
document.write( "Previously it cost her 22.80 for 1 Pizza and 6  Drinks. <BR>\n" );
document.write( "What do the 2 variables represent.<BR>\n" );
document.write( "Write a system of equations to represent the model<BR>\n" );
document.write( "What is the cost of 1 Drink.? What is the cost of 1 Pizza? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #563803 by </B><A HREF=/tutors/aboutme.mpl?userid=Hawksfan><B>Hawksfan(61)</B></A><img src=\"/images/stars/stars-08.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Hawksfan><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=Hawksfan><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=563803\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let P = # of Pizzas<BR>\n" );
document.write( "Let D = # of Drinks\r<BR>\n" );
document.write( "\n" );
document.write( "We need to write two equations with two unknowns and solve the problem. \r<BR>\n" );
document.write( "\n" );
document.write( "First equation: \r<BR>\n" );
document.write( "\n" );
document.write( "5P + 40D = 136\r<BR>\n" );
document.write( "\n" );
document.write( "Second equation :\r<BR>\n" );
document.write( "\n" );
document.write( "1P + 6D = 22.80\r<BR>\n" );
document.write( "\n" );
document.write( "Now combine the equations by putting them side by side:\r<BR>\n" );
document.write( "\n" );
document.write( "5P + 40D = 136<BR>\n" );
document.write( "1P + 6D  = 22.80    we need to get the additive opposite of P or D<BR>\n" );
document.write( "                    lets multiply the second equation by -5 \r<BR>\n" );
document.write( "\n" );
document.write( "5P + 40D =136<BR>\n" );
document.write( "-5P+ -30D = -114  now add the two equations\r<BR>\n" );
document.write( "\n" );
document.write( "   10D = 22<BR>\n" );
document.write( "    D = 2.2 or 2 drinks     \r<BR>\n" );
document.write( "\n" );
document.write( "1P + 6D = 22.80\r<BR>\n" );
document.write( "\n" );
document.write( "P + 6(2.2) = 22.80<BR>\n" );
document.write( "P +13.2 = 22.8<BR>\n" );
document.write( "P = 9.6 pizzas   or 9 pizzas \r<BR>\n" );
document.write( "\n" );
document.write( " you can also solve this by substitution </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );