document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=203755>Question 203755</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/9780073533490/algebrahomeworkh>Elementary and Intermediate Algebra</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> I really need help understanding how to answer these questions using the addition method...I want to learn this!!! For some reason I am just not getting it???\r<BR>\n" );
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document.write( "12.)  x-2y=-1<BR>\n" );
document.write( "   -x+5y=11\r<BR>\n" );
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document.write( "16.) 3x+5y=-11<BR>\n" );
document.write( "x-2y=11\r<BR>\n" );
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document.write( "22.) 2x=2-y<BR>\n" );
document.write( "3x+y=-1\r<BR>\n" );
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document.write( "Thank you, thank you, thank you!!!! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #153728 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=153728\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I really need help understanding how to answer these questions using the addition method...I want to learn this!!! For some reason I am just not getting it??? <BR>\n" );
document.write( "12.) <BR>\n" );
document.write( "x-2y=-1<BR>\n" );
document.write( "-x+5y=11 <BR>\n" );
document.write( "---<BR>\n" );
document.write( "Add the two equations to solve for \"y\":<BR>\n" );
document.write( "3y = 10<BR>\n" );
document.write( "y = 10/3<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "Substitute into either of the two original equations to solve for \"x\":<BR>\n" );
document.write( "x = 2y-1<BR>\n" );
document.write( "x = 2(10/3)-1<BR>\n" );
document.write( "x = 20/3 - 3/3<BR>\n" );
document.write( "x = 17/3<BR>\n" );
document.write( "-------------------<BR>\n" );
document.write( "Ans: (17/3 , 10/3)<BR>\n" );
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document.write( "16.) <BR>\n" );
document.write( "3x+5y=-11<BR>\n" );
document.write( "x-2y=11<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Multiply the 2nd equation by 3 to get:<BR>\n" );
document.write( "3x+4y = -11<BR>\n" );
document.write( "3x-6y = 33<BR>\n" );
document.write( "-----------------<BR>\n" );
document.write( "Subtract the 2nd from the 1st so you can solve for \"y\":<BR>\n" );
document.write( "10y = -44<BR>\n" );
document.write( "y = -22/5<BR>\n" );
document.write( "-----------<BR>\n" );
document.write( "Substitute into x = 2y+11 to solve for \"x\":<BR>\n" );
document.write( "x = 2(-22/5)+(55/5)<BR>\n" );
document.write( "x = 11/5<BR>\n" );
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document.write( "Ans: (11/5 , -22/5)<BR>\n" );
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document.write( "22.) <BR>\n" );
document.write( "2x=2-y<BR>\n" );
document.write( "3x+y=-1 <BR>\n" );
document.write( "---<BR>\n" );
document.write( "Rearrange:<BR>\n" );
document.write( "2x + y = 2<BR>\n" );
document.write( "3x + y = -1<BR>\n" );
document.write( "--------<BR>\n" );
document.write( "Subtract 1st from 2nd to solve for \"x\":<BR>\n" );
document.write( "x = -3<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Substitute into y = -2x+2 to solve for \"y\":<BR>\n" );
document.write( "y = -2(-3)+2<BR>\n" );
document.write( "y = 8<BR>\n" );
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document.write( "Ans: (-3 , 8)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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document.write( " </SPAN>\n" );
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