document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=693687>Question 693687</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve for \"c\" using the substitution method. <BR>\n" );
document.write( "5x-7y=c<BR>\n" );
document.write( "-15x+21y=9 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #427514 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=427514\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Solve for \"c\" using the substitution method.<BR>\n" );
document.write( " 5x - 7y = c<BR>\n" );
document.write( "-15x+21y = 9<BR>\n" );
document.write( "Use the 1st equation for substitution<BR>\n" );
document.write( "5x = 7y + c<BR>\n" );
document.write( "Divide by 5<BR>\n" );
document.write( "x = 1.4y + .2c<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Replace x with (1.4y+.2c) in the 2nd equation<BR>\n" );
document.write( "-15(1.4y + .2c) + 21y = 9<BR>\n" );
document.write( "-21y - 3c + 21y = 9<BR>\n" );
document.write( "-3c = 9<BR>\n" );
document.write( "c = 9/-3<BR>\n" );
document.write( "c = -3 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );