Khan Academy
Khan Academy: Interpreting Graphs of Functions
Interpret the graphs of both linear and nonlinear functions. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.
Mangahigh
Mangahigh: Algebra: Form Equations With Exponents
Mangahigh is a website with math games aimed at twelve to eighteen year olds. On this site students form nonlinear equations.
Interactive Mathematics
Interactive Mathematics: Graphical Solution of Non Linear Systems
Using the graphing method, several systems of nonlinear equations are solved. Follow each example step by step to see how solutions are derived.
Texas Instruments
Texas Instruments: Getting Started With the Ti Navigator: Quadratic Equations
This lesson introduces students to Activity Center and is intended to help students write systems of equations in standard form in slope intercept form to solve the system using tables and graphs.
Texas Instruments
Texas Instruments: Getting Started With the Ti Navigator System: River of Life
This lesson introduces students to Activity Center and is intended to help students develop the conceptual understanding of how to identify functions as linear or nonlinear and contrast their properties from tables, graphs, or equations.
Richland Community College
Richland Community College: Math 116 Lecture Notes
This site from the Richland Community College provides the detailed lecture notes to a college algebra course, complete with equations and definitions. Content ranges from "functions and their graphs" to "conics and parametric equations."