document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=99374>Question 99374</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Dont get this at all - <BR>\n" );
document.write( "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 = -4 and y = 7.<BR>\n" );
document.write( "The equation would be z = kxy - right???<BR>\n" );
document.write( "Now<BR>\n" );
document.write( "x = 1, y = 1/3, z = 5<BR>\n" );
document.write( "x = -6, y = 3, z = 2/5<BR>\n" );
document.write( "Dont know what to do at all<BR>\n" );
document.write( "HELP<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #72299 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=72299\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The variable Z varies jointly with x and y. <BR>\n" );
document.write( "Use the given values to write an equation relating x, y, and z. <BR>\n" );
document.write( "Then find Z when x = -4 and y = 7.<BR>\n" );
document.write( "The equation would be z = kxy - right???<BR>\n" );
document.write( "That is correct<BR>\n" );
document.write( "-----------<BR>\n" );
document.write( "If x=-4 and y = 7, then z = k(-4)(7); z=-28k<BR>\n" );
document.write( "------------------<BR>\n" );
document.write( "Now<BR>\n" );
document.write( "x = 1, y = 1/3, z = 5<BR>\n" );
document.write( "5 = k(1*(1/3)), k= 15<BR>\n" );
document.write( "---------<BR>\n" );
document.write( "x = -6, y = 3, z = 2/5<BR>\n" );
document.write( "(2/5) = k(-6)(3)<BR>\n" );
document.write( "(2/5) = -18k<BR>\n" );
document.write( "(1/5) = -9k<BR>\n" );
document.write( "k= -1/45<BR>\n" );
document.write( "============<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );