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February 1st, 2017, 11:30 AM  #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=(1258p)/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, 09:01 PM  #2 
Senior Member Joined: Sep 2015 From: CA Posts: 1,303 Thanks: 667 
$6q + 8p = 125$ $6q = 125  8p$ $q = \dfrac{1258p}{6}$ 

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