document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=837118>Question 837118</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve equation using substitution<BR>\n" );
document.write( "X = y + 8<BR>\n" );
document.write( "5x + 3y =12<BR>\n" );
document.write( "so I put x in 5x = 5(y+8)+3y=12 = 8y + 40 = 12 now I subtract 40 and get 8y=-28 which give me -28/8 or y= -7/2, so when I plug into y what is my answer for X. the teacher said they a reasonable solution. But I am lost, my dad says no solution, I don't really know.  Im in 8th grade algebra  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #504491 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39618)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=504491\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Clarifying what you tried to do:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=X%3C%3Ex ALIGN=MIDDLE  ALT=\"X%3C%3Ex\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "Choose which way you are using in any given problem and use the variable consistently.  <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=x ALIGN=MIDDLE  ALT=\"x=x\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=X=X ALIGN=MIDDLE  ALT=\"X=X\"   DISABLED_style= \"max-width:90%; height:auto;\" >, but <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%3C%3EX ALIGN=MIDDLE  ALT=\"x%3C%3EX\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=X%3C%3Ex ALIGN=MIDDLE  ALT=\"X%3C%3Ex\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "Your given system:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=y%2B8 ALIGN=MIDDLE  ALT=\"x=y%2B8\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5x%2B3y=12 ALIGN=MIDDLE  ALT=\"5x%2B3y=12\"   DISABLED_style= \"max-width:90%; height:auto;\" >;<BR>\n" );
document.write( "Most of what you show looks good.<BR>\n" );
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document.write( "You have a formula for x as one of the given equations.<BR>\n" );
document.write( "Substitute...<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5%28y%2B8%29%2B3y=12 ALIGN=MIDDLE  ALT=\"5%28y%2B8%29%2B3y=12\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5y%2B40%2B3y=12 ALIGN=MIDDLE  ALT=\"5y%2B40%2B3y=12\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8y%2B40=12 ALIGN=MIDDLE  ALT=\"8y%2B40=12\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8y=12-40 ALIGN=MIDDLE  ALT=\"8y=12-40\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8y=-28 ALIGN=MIDDLE  ALT=\"8y=-28\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2y=-7 ALIGN=MIDDLE  ALT=\"2y=-7\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28y=-7%2F2%29 ALIGN=MIDDLE  ALT=\"highlight%28y=-7%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > just as you found.  (You showed one arithmetic mistake, like you intended division by 4 but wrote division by 8).<BR>\n" );
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document.write( "Use the value for y to find the value of x, from your original first equation:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=y%2B8 ALIGN=MIDDLE  ALT=\"x=y%2B8\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=-%287%2F2%29%2B8 ALIGN=MIDDLE  ALT=\"x=-%287%2F2%29%2B8\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=-%287%2F2%29%2B8%282%2F2%29 ALIGN=MIDDLE  ALT=\"x=-%287%2F2%29%2B8%282%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=-%287%2F2%29%2B16%2F2 ALIGN=MIDDLE  ALT=\"x=-%287%2F2%29%2B16%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28x=9%2F2%29 ALIGN=MIDDLE  ALT=\"highlight%28x=9%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "SUMMARY OF ANSWER RESULTS: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=9%2F2 ALIGN=MIDDLE  ALT=\"x=9%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=-%287%2F2%29 ALIGN=MIDDLE  ALT=\"y=-%287%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );