document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=69431>Question 69431</A>: <I><SPAN STYLE=\"word-break: break-all;\"> i have to solve the problems using system of equations.. <BR>\n" );
document.write( "1.x+y=6          2. 2x-3y=-13<BR>\n" );
document.write( "  y=2x               y=2x+7  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #49527 by </B><A HREF=/tutors/aboutme.mpl?userid=mathick><B>mathick(4)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mathick><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=mathick><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=49527\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let's start with #1:\r<BR>\n" );
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document.write( "x + y = 6<BR>\n" );
document.write( "    y = 2x.<BR>\n" );
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document.write( "There are a few ways to solve these, but the substitution method is often easiest.  <BR>\n" );
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document.write( "1.  Substitute 2x in for y in the 1st equation:     x + (2x) = 6.<BR>\n" );
document.write( "(This can be done because the 2nd equation says y and 2x are interchangeable).<BR>\n" );
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document.write( "2.  Simplify:                                        3x = 6.<BR>\n" );
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document.write( "3.  Solve for x:                                      x = 2.<BR>\n" );
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document.write( "4.  Plug 2 in for x in the 1st equation:              2 + y = 6.<BR>\n" );
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document.write( "5.  Solve for y:                                        y = 4.<BR>\n" );
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document.write( "6.  Final Answer:                                      (2, 4).  (x = 2, y = 4).<BR>\n" );
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document.write( "That's the substitution method - the next example has a few more steps:<BR>\n" );
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document.write( "2x-3y=-13<BR>\n" );
document.write( "   y=2x+7 <BR>\n" );
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document.write( "1.  Substitute 2x + 7 in for y in the 1st equation:     2x - 3(2x + 7) = -13.<BR>\n" );
document.write( "(This can be done because the 2nd equation says y and 2x + 7 are interchangeable).<BR>\n" );
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document.write( "2.  Simplify:                                        -4x - 21 = -13.<BR>\n" );
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document.write( "3.  Solve for x:                                      x = -2.<BR>\n" );
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document.write( "4.  Plug -2 in for x in the 1st equation:              2(-2) - 3y = -13.<BR>\n" );
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document.write( "5.  Solve for y:                                        y = 3.<BR>\n" );
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document.write( "6.  Final Answer:                                      (-2, 3). (x = -2, y = 3). </SPAN>\n" );
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