document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=679308>Question 679308</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I want to know how do i solve this problem? can you please explain me step by step:\r<BR>\n" );
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document.write( "Solving equations for 2 unknowns:<BR>\n" );
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document.write( "3a+4b=9<BR>\n" );
document.write( "2a+2b=6 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #421913 by </B><A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><B>ReadingBoosters(3246)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><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=421913\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Multiply the second equation by -2<BR>\n" );
document.write( "-2(2a+2b=6)<BR>\n" );
document.write( "-4a - 4b = -12<BR>\n" );
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document.write( "Add to the first equation<BR>\n" );
document.write( "3a + -4a + 4b - 4b = 9 + -12<BR>\n" );
document.write( "Combine like terms<BR>\n" );
document.write( "-a = -3<BR>\n" );
document.write( "Divide both sides by -1<BR>\n" );
document.write( "a = 3<BR>\n" );
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document.write( "Plug the a value into either equation<BR>\n" );
document.write( "3(3) + 4b = 9<BR>\n" );
document.write( "9 + 4b = 9<BR>\n" );
document.write( "Isolate the b variable<BR>\n" );
document.write( "4b = 0<BR>\n" );
document.write( "Divide both sides by 4<BR>\n" );
document.write( "b = 0<BR>\n" );
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document.write( "a = 3<BR>\n" );
document.write( "b = 0<BR>\n" );
document.write( ".....................<BR>\n" );
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