document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=961155>Question 961155</A>: <I><SPAN STYLE=\"word-break: break-all;\"> since my eng not good ,I have try to work this math lab question on my own. I need some help, Please let me if I did it correctly or need to fix it. \r<BR>\n" );
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document.write( "Question:<BR>\n" );
document.write( "The school raised $1518.75 by charging an adult $3.75 and a student $2.50. <BR>\n" );
document.write( "The total attendance was 520. How many adult and how many students attended?\r<BR>\n" );
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document.write( "a. write a linear system to model this situation.<BR>\n" );
document.write( "b. express each equation in slope-interccept form and graph each line.<BR>\n" );
document.write( "c. determine this coordinates of the point of intersection of the line.<BR>\n" );
document.write( "d. how to verify the solution in step C by using tables of values?<BR>\n" );
document.write( "e. verify your solution by using the data in the given problem.<BR>\n" );
document.write( "f. how can you use your results to determine the number of adults and the number of student who attended the carnival ? \r<BR>\n" );
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document.write( "my ans:\r<BR>\n" );
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document.write( "a)<BR>\n" );
document.write( " x= # of adult<BR>\n" );
document.write( "y=# of student\r<BR>\n" );
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document.write( "x+y=520<BR>\n" );
document.write( "3.75x+2.50y=1518.75\r<BR>\n" );
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document.write( "b)<BR>\n" );
document.write( "y=mx+b\r<BR>\n" );
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document.write( "x+y=520<BR>\n" );
document.write( "y=520-x\r<BR>\n" );
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document.write( "3.75x+2.50y=1518.75<BR>\n" );
document.write( "2.50y=-3.75x+1518.75<BR>\n" );
document.write( "y=-3.75/2.50x +1518.75/2.50<BR>\n" );
document.write( "y=1.5x +607.5         ***(  it's correct if is not whole number ?) I couldn't graph this ***       <BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #587412 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=587412\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> your calculations are correct except for the last value for y<BR>\n" );
document.write( "y = 1.5x +607.5 <BR>\n" );
document.write( "should be<BR>\n" );
document.write( "y = -1.5x +607.5<BR>\n" );
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document.write( "now graph the two equations<BR>\n" );
document.write( "y = 520 -x <BR>\n" );
document.write( "y = -1.5x +607.5<BR>\n" );
document.write( "first equation will be red color and second equation is green color<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+graph%28+300%2C+200%2C+-650%2C+650%2C+-650%2C+650%2C+-x+%2B520%2C+-1.5x+%2B607.5%29+ ALIGN=MIDDLE  ALT=\"+graph%28+300%2C+200%2C+-650%2C+650%2C+-650%2C+650%2C+-x+%2B520%2C+-1.5x+%2B607.5%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "from the graph, our point of intersection is (175, 345)<BR>\n" );
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document.write( "to check the work set your two equations for y equal to each other<BR>\n" );
document.write( "520 -x = -1.5x +607.5<BR>\n" );
document.write( "add x to both sides of =<BR>\n" );
document.write( "520 = -.5x +607.5<BR>\n" );
document.write( "subtract 607.5 from both sides of =<BR>\n" );
document.write( "-87.5 = -.5x<BR>\n" );
document.write( "divide both sides of = by -.5<BR>\n" );
document.write( "-87.5/-.5 = x<BR>\n" );
document.write( "175 = x<BR>\n" );
document.write( "now substitute for x in the equation<BR>\n" );
document.write( "y = 520 -x<BR>\n" );
document.write( "y = 520 - 175 = 345<BR>\n" );
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document.write( "there are 175 adults and 345 students\r<BR>\n" );
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