document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=816587>Question 816587</A>: <I><SPAN STYLE=\"word-break: break-all;\"> You purchase 8 gal of paint and 3 brushes for $152.50.  The next day, you purchase 6 gal of paint and 2 brushes for $113.00. How much does each gallon of paint and each brush cost? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #491604 by </B><A HREF=/tutors/aboutme.mpl?userid=erica65404><B>erica65404(394)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=erica65404><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=erica65404><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=491604\">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=x ALIGN=MIDDLE  ALT=\"x\"   DISABLED_style= \"max-width:90%; height:auto;\" > =  cost per gallon of paint and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y ALIGN=MIDDLE  ALT=\"y\"   DISABLED_style= \"max-width:90%; height:auto;\" > = cost per brush<BR>\n" );
document.write( "Day 1 : <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8x+%2B+3y+=+152.50 ALIGN=MIDDLE  ALT=\"8x+%2B+3y+=+152.50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Day 2 : <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=6x+%2B+2y+=+113.00 ALIGN=MIDDLE  ALT=\"6x+%2B+2y+=+113.00\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "We are going to solve day 2 for y so we can plug y into day 1.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=6x+%2B+2y+=+113.00 ALIGN=MIDDLE  ALT=\"6x+%2B+2y+=+113.00\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2y+=+-6x+%2B+113.00 ALIGN=MIDDLE  ALT=\"2y+=+-6x+%2B+113.00\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+=+-3x+%2B+56.50 ALIGN=MIDDLE  ALT=\"y+=+-3x+%2B+56.50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now since we know what y equals, we can use the substitution method and plug y into the day 1 equation. \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8x+%2B+3%28-3x+%2B+56.50%29+=+152.50 ALIGN=MIDDLE  ALT=\"8x+%2B+3%28-3x+%2B+56.50%29+=+152.50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8x+-+9x+%2B+169.50+=+152.50 ALIGN=MIDDLE  ALT=\"8x+-+9x+%2B+169.50+=+152.50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-x+%2B+169.50+=+152.50 ALIGN=MIDDLE  ALT=\"-x+%2B+169.50+=+152.50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-x+=+-17 ALIGN=MIDDLE  ALT=\"-x+=+-17\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+17 ALIGN=MIDDLE  ALT=\"x+=+17\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "the cost of a gallon of paint is $17.  plug 17 in for x in the day 1 equation to find y.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8%2817%29+%2B+3y+=+152.50 ALIGN=MIDDLE  ALT=\"8%2817%29+%2B+3y+=+152.50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=136+%2B+3y+=+152.50 ALIGN=MIDDLE  ALT=\"136+%2B+3y+=+152.50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3y+=+16.50 ALIGN=MIDDLE  ALT=\"3y+=+16.50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+=+5.50 ALIGN=MIDDLE  ALT=\"y+=+5.50\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "The cost of a single brush is $5.50. </SPAN>\n" );
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