document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=764794>Question 764794</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I multiplied the bottom equation by -4 to cancel out the y's then subtracted the two equations but got the wrong answer.\r<BR>\n" );
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document.write( "Solve each system of equations. \r<BR>\n" );
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document.write( "9x^2+4y^2=144 <BR>\n" );
document.write( "x^2+y^2=25\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #465731 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=465731\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Solve each system of equations.<BR>\n" );
document.write( "9x^2 + 4y^2 = 144<BR>\n" );
document.write( "x^2 + y^2 = 25<BR>\n" );
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document.write( "After you multiply the 2nd equation by -4, you want add the equations<BR>\n" );
document.write( "9x^2 + 4y^2 = 144<BR>\n" );
document.write( "-4x^2 -4y^2 = -100<BR>\n" );
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document.write( "5y^2 = 44<BR>\n" );
document.write( "y^2 = 44/5<BR>\n" );
document.write( "y = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%2844%2F5%29 ALIGN=MIDDLE  ALT=\"sqrt%2844%2F5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "y = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%2Asqrt%2811%2F5%29 ALIGN=MIDDLE  ALT=\"2%2Asqrt%2811%2F5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "y ~ 2.966 <BR>\n" );
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document.write( "Find x using the 2n original equation; y^2 = 44/5<BR>\n" );
document.write( "x^2 + 44/5 = 25<BR>\n" );
document.write( "multiply both sides by 5<BR>\n" );
document.write( "5x^2 + 44 = 125<BR>\n" );
document.write( "5x^2 = 125 - 44<BR>\n" );
document.write( "5x^2 = 81<BR>\n" );
document.write( "x^2 = 81/5<BR>\n" );
document.write( "x = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%2881%2F5%29 ALIGN=MIDDLE  ALT=\"sqrt%2881%2F5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "x = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=9%2Asqrt%281%2F5%29 ALIGN=MIDDLE  ALT=\"9%2Asqrt%281%2F5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "x ~ 4.025<BR>\n" );
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document.write( "Check this on a calc: enter (81/5) + (44/5) results: 25 </SPAN>\n" );
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