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Most of the article about linear functions is actually about affine functions. There should be a page on affine functions or first order polynomials and this page should point to those. Somewhere on the page about linear functions it should contain the definition of a linear function: <math>f(ax_1+bx_2)=af(x_1)+bf(x_2)</math>. <small>—The preceding [[Wikipedia:Sign your posts on talk pages|unsigned]] comment was added by [[User:Dsignoff|Dsignoff]] ([[User talk:Dsignoff|talk]] • [[Special:Contributions/Dsignoff|contribs]]) 05:25, 10 February 2007 (UTC).</small><!-- HagermanBot Auto-Unsigned -->
I am finding the same thing. The distinction between linear functions and affine functions is a very important one if you are looking at solving problems with linear algebra.
As an example, if you model a network of electrical resistors with linear functions, you can relatively easily solve for current through them using matrices and linear algebra. If you assume that they are affine functions then the problem becomes much more difficult. Things like lightbulbs and diodes might require affine functions.
[[User:Marcusyoder|Marcusyoder]] ([[User talk:Marcusyoder|talk]]) 16:29, 26 August 2012 (UTC)
== Relationship between two functions ==
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