document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=329501>Question 329501</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The variable z varies jointly with x and y. Use the given values to write an equation relating x, y, and z. Then find z when x=-1 and y=4.\r<BR>\n" );
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document.write( "1) x=2, y=4, z=-2<BR>\n" );
document.write( "2) x=4, y=1/2, z=-1 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #236211 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=236211\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The variable z varies jointly with x and y. Use the given values to write an equation relating x, y, and z. Then find z when x=-1 and y=4.\r<BR>\n" );
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document.write( "1) x=2, y=4, z=-2<BR>\n" );
document.write( "--------------<BR>\n" );
document.write( "z = kxy<BR>\n" );
document.write( "-2 = k*2*4<BR>\n" );
document.write( "k = -1/4<BR>\n" );
document.write( "--------------<BR>\n" );
document.write( "Then find z when x=-1 and y=4.<BR>\n" );
document.write( "z = (-1/4)*(-1)*4<BR>\n" );
document.write( "z = 1<BR>\n" );
document.write( " </SPAN>\n" );
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