Windstream
Ojk's Precalculus Study Page: Functions of Two Variables
An introduction to functions with two variables, including several examples relating to linear programming. The tutorial includes graphical examples of the functions and also review questions located at the bottom of the page.
Windstream
Ojk's Precalculus Study Page: Functions Sample Test
A practice test covering the basics of functions, including domain, range, operations, and graphing. Includes an answer page.