document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=459012>Question 459012</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do you find x and y of this rectangle when sides:<BR>\n" );
document.write( "AB = -2x<BR>\n" );
document.write( "DC = 7y + 1<BR>\n" );
document.write( "AD = -x<BR>\n" );
document.write( "BC = 2y + 2\r<BR>\n" );
document.write( "\n" );
document.write( "AB = DC<BR>\n" );
document.write( "AD = BC\r<BR>\n" );
document.write( "\n" );
document.write( "I know you use substitution, I'm just not sure how to... Thank you so much in advance! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #314901 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=314901\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> How do you find x and y of this rectangle when sides:<BR>\n" );
document.write( "AB = -2x<BR>\n" );
document.write( "DC = 7y + 1<BR>\n" );
document.write( "AD = -x<BR>\n" );
document.write( "BC = 2y + 2<BR>\n" );
document.write( "AB = DC<BR>\n" );
document.write( "AD = BC <BR>\n" );
document.write( ":<BR>\n" );
document.write( "Draw out a rectangle ABCD, label each side as given:<BR>\n" );
document.write( "Put the equations in the standard form<BR>\n" );
document.write( " AB=DC, therefore:<BR>\n" );
document.write( "-2x = 7y+1<BR>\n" );
document.write( "-2x - 7y = 1<BR>\n" );
document.write( "2x + 7y = -1; multiplied by -1<BR>\n" );
document.write( "and<BR>\n" );
document.write( "AD=BC, therefore<BR>\n" );
document.write( "-x = 2y+2<BR>\n" );
document.write( "-x - 2y = 2<BR>\n" );
document.write( "x + 2y = -2<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Use these two equation for elimination<BR>\n" );
document.write( "2x + 7y = -1<BR>\n" );
document.write( " x + 2y = -2<BR>\n" );
document.write( "multiply the 2nd equation by 2<BR>\n" );
document.write( "2x + 7y = -1<BR>\n" );
document.write( "2x + 4y = -4<BR>\n" );
document.write( "---------------Subtracting eliminates x, find y<BR>\n" );
document.write( "3y = 3<BR>\n" );
document.write( "y = 1<BR>\n" );
document.write( ":<BR>\n" );
document.write( "You should be able to find x, check to make sure opposite sides are equal </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );