document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=279315>Question 279315</A>: <I><SPAN STYLE=\"word-break: break-all;\"> hi my daughter has come home with and algebra question and I can't remember how to do it <BR>\n" );
document.write( "question is a+b/c =7 and a-b/c=1 what is b?<BR>\n" );
document.write( "Sorry i don't know where the underscore is but both formulas are over c.<BR>\n" );
document.write( "thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #204792 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=204792\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> not underscore but forward slash under the ?\r<BR>\n" );
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document.write( "We can't get a number value for b since we have three unknowns(variables) and only two equations.<BR>\n" );
document.write( "We can only find b in terms of a or in terms of c\r<BR>\n" );
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document.write( "(a+b)/c=7<BR>\n" );
document.write( "(a-c)/c=1<BR>\n" );
document.write( "multiply both equations both sides by c<BR>\n" );
document.write( "a+b=7c (1)<BR>\n" );
document.write( "a-c=c<BR>\n" );
document.write( "a=2c<BR>\n" );
document.write( "c=a/2<BR>\n" );
document.write( "substitute a/2 for c in equation (1)<BR>\n" );
document.write( "a+b=7*a/2<BR>\n" );
document.write( "multiply by 2<BR>\n" );
document.write( "2a+2b=7a<BR>\n" );
document.write( "2b=5a<BR>\n" );
document.write( "b=5a/2\r<BR>\n" );
document.write( "<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );