document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=87497>Question 87497</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0495188891/algebrahomeworkh>Intermediate Algebra</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Can you please help me with these two problems I would appreciate it.  <BR>\n" );
document.write( "Solve each system by substitution, if possible. If a system is inconsistent or if the equations are dependent, so indicate.<BR>\n" );
document.write( "2x-y=-21<BR>\n" );
document.write( "4x+5y=7<BR>\n" );
document.write( "and<BR>\n" );
document.write( "Solve the system of equations using the addition (elimination) method.<BR>\n" );
document.write( "-7x+y=8<BR>\n" );
document.write( "2x-y=2\r<BR>\n" );
document.write( "\n" );
document.write( "Thank you in advance I really appreciate it. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #63434 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=63434\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Solve each system by substitution, if possible. If a system is inconsistent or if the equations are dependent, so indicate.<BR>\n" );
document.write( "2x-y=-21<BR>\n" );
document.write( "4x+5y=7<BR>\n" );
document.write( "---------<BR>\n" );
document.write( "Multiply the 1st equation by 2 to get:<BR>\n" );
document.write( "4x-2y = -42<BR>\n" );
document.write( "Subtract from 4x+5y=7 to get:<BR>\n" );
document.write( "7y = 49<BR>\n" );
document.write( "y = 7<BR>\n" );
document.write( "--------<BR>\n" );
document.write( "Substitue to solve for x, as follows:<BR>\n" );
document.write( "2x-7 = -21<BR>\n" );
document.write( "2x = -14<BR>\n" );
document.write( "x=-7<BR>\n" );
document.write( "-----------<BR>\n" );
document.write( "Solution: x=-7; y=7<BR>\n" );
document.write( "==========================\r<BR>\n" );
document.write( "\n" );
document.write( "Solve the system of equations using the addition (elimination) method.<BR>\n" );
document.write( "-7x+y=8<BR>\n" );
document.write( "2x-y=2 <BR>\n" );
document.write( "----------<BR>\n" );
document.write( "Add the two equations to eliminate the y terms:<BR>\n" );
document.write( "-5x = 10<BR>\n" );
document.write( "x = -2<BR>\n" );
document.write( "------------<BR>\n" );
document.write( "Substitute and solve for y, as follows:<BR>\n" );
document.write( "-7*-2+y=8<BR>\n" );
document.write( "y=-6<BR>\n" );
document.write( "-----------<BR>\n" );
document.write( "Check in the other equation:<BR>\n" );
document.write( "-7*-2+-6 = 8<BR>\n" );
document.write( "8=8<BR>\n" );
document.write( "=================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );