# S.O.S. Mathematics CyberBoard

Your Resource for mathematics help on the web!
 It is currently Thu, 23 May 2013 05:27:27 UTC

 All times are UTC [ DST ]

 Page 1 of 1 [ 2 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: Variation problemPosted: Fri, 27 Jan 2012 01:38:57 UTC
 S.O.S. Newbie

Joined: Fri, 27 Jan 2012 01:31:07 UTC
Posts: 1
Here's a question in my textbook that I wanted to solve for the past few days, "Suppose x varies inversely with y and y varies inversely with z. How does x vary with z?"

I thought it would be something like: x = a/y & y = a/z. I solved for y in the first equation and got that y = a/x. Then I went back and plugged that back into the second equation and then got a/x=a/z, then I solved for x, and found out that x = z.

But my teacher told me that it's wrong, any help would be much appreciated.

Top

 Post subject: Re: Variation problemPosted: Fri, 27 Jan 2012 06:39:25 UTC
 Moderator

Joined: Wed, 30 Mar 2005 04:25:14 UTC
Posts: 12103
Location: Austin, TX
Zubei wrote:
Here's a question in my textbook that I wanted to solve for the past few days, "Suppose x varies inversely with y and y varies inversely with z. How does x vary with z?"

I thought it would be something like: x = a/y & y = a/z. I solved for y in the first equation and got that y = a/x. Then I went back and plugged that back into the second equation and then got a/x=a/z, then I solved for x, and found out that x = z.

But my teacher told me that it's wrong, any help would be much appreciated.

The constants do not have to be the same, so you should end up with x = kz for some k, in other words x and z vary directly.

_________________
(\ /)
(O.o)
(> <)
This is Bunny. Copy Bunny into your signature to help him on his way to world domination

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 2 posts ]

 All times are UTC [ DST ]

#### Who is online

Users browsing this forum: No registered users

 You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forum

Search for:
 Jump to:  Select a forum ------------------ High School and College Mathematics    Algebra    Geometry and Trigonometry    Calculus    Matrix Algebra    Differential Equations    Probability and Statistics    Proposed Problems Applications    Physics, Chemistry, Engineering, etc.    Computer Science    Math for Business and Economics Advanced Mathematics    Foundations    Algebra and Number Theory    Analysis and Topology    Applied Mathematics    Other Topics in Advanced Mathematics Other Topics    Administrator Announcements    Comments and Suggestions for S.O.S. Math    Posting Math Formulas with LaTeX    Miscellaneous
Contact Us | S.O.S. Mathematics Homepage
Privacy Statement | Search the "old" CyberBoard

users online during the last hour
Powered by phpBB © 2001, 2005-2011 phpBB Group.
Copyright © 1999-2013 MathMedics, LLC. All rights reserved.
Math Medics, LLC. - P.O. Box 12395 - El Paso TX 79913 - USA