document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=71929>Question 71929</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I don't know where to start. Can you explain what I am meant to be doing to solve these two questions?\r<BR>\n" );
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document.write( "a) 3x + 2y = 5<BR>\n" );
document.write( "         y = 5x - 17\r<BR>\n" );
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document.write( "b) 2x + 3y = 21<BR>\n" );
document.write( "     x - y = 18 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #51413 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=51413\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a) 3x + 2y = 5<BR>\n" );
document.write( "y = 5x - 17<BR>\n" );
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document.write( "Substitute y=5x-1 into the 1st equation in order to solve for \"x\":<BR>\n" );
document.write( "3x + 2(5x-17) = 5<BR>\n" );
document.write( "3x + 10x-34 = 5<BR>\n" );
document.write( "13x=39<BR>\n" );
document.write( "x=3<BR>\n" );
document.write( "--------<BR>\n" );
document.write( "Substitute that value of x into y=5x-17 to solve for \"y\":<BR>\n" );
document.write( "y=5*3-17 <BR>\n" );
document.write( "y=-2<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "Solution x=3 and y=-2<BR>\n" );
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document.write( "b) 2x + 3y = 21<BR>\n" );
document.write( "x - y = 18\r<BR>\n" );
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document.write( "Solve for y: y=x-18<BR>\n" );
document.write( "Substitute in the 1st equation to solve for \"x\":<BR>\n" );
document.write( "2x+3(x-18)=21<BR>\n" );
document.write( "2x+3x-54=21<BR>\n" );
document.write( "5x=75<BR>\n" );
document.write( "x=15<BR>\n" );
document.write( "Substitute that into y=x-18 to solve for \"y\":<BR>\n" );
document.write( "y=15-18<BR>\n" );
document.write( "y=-3<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "Solution: x=15; y=-3<BR>\n" );
document.write( "=========<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
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