My Math Forum Working out the demand function ?!?!?

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 February 1st, 2017, 12:30 PM #1 Newbie   Joined: Feb 2017 From: Eastbourne Posts: 1 Thanks: 0 Working out the demand function ?!?!? So I'm having a few difficulties here.... I am currently reading Mathematics for Economics and Finance by Martin Anthony & Norman Biggs. The very first example on page 2 of chapter 1 and I am already stuck.. The example is as follows : Suppose that demand set D consists of the points (q,p) on the straight line 6q+8p = 125. Then for a given value of p we can determine the corresponding q; we simply rearrange the equation of the line in the form q=(125-8p)/6 Now I think I can grasp most of the equation, however, the part I am confused with is the 125. Where has that come from ?
 February 1st, 2017, 10:01 PM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 1,652 Thanks: 839 $6q + 8p = 125$ $6q = 125 - 8p$ $q = \dfrac{125-8p}{6}$

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