document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=876667>Question 876667</A>: <I><SPAN STYLE=\"word-break: break-all;\"> given that y varies directly with x, and x=7 when y=63, find y when x=20 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #528942 by </B><A HREF=/tutors/aboutme.mpl?userid=JPereyra58><B>JPereyra58(1)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=JPereyra58><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=JPereyra58><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=528942\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Given that y varies directly with x then, y = kx for some k in R ----(1)<BR>\n" );
document.write( "So, for x = 7, y = 63 replacing this values in (1)<BR>\n" );
document.write( "We have, 63 = 7k => k = 63/7 => k = 9.<BR>\n" );
document.write( "For x = 20 using (1) and k = 9, we have that y = (9)(20) = 180.<BR>\n" );
document.write( "therefore, y = 180 when x = 20. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );