Learn about functions, their properties, and how to work with them in algebra on Khan Academy.

"Students are introduced to functions in the context of linear equations and area/volume formulas in Module 5. They define, evaluate, and compare functions using equations of lines as a …

When distances, prices, or any other quantity in our world changes at a constant rate, we can use linear functions to model them. Let's learn how different representations, including graphs and …

Finding the domain and range of a piecewise function that is constant in each segment. Such functions are called "step functions."

- [Instructor] In this video, we're gonna do a few examples finding domains of functions. So let's say that we have the function f of x is equal to x plus five over x minus two. What is going to be …

Given the graph of a discrete function, Sal shows how to evaluate the function for a few different values.

This fascinating concept allows us to graph many other types of functions, like square/cube root, exponential and logarithmic functions. We can think graphs of absolute value and quadratic …

A function is said to be an odd function if its graph is symmetric with respect to the origin. Visually, this means that you can rotate the figure about the origin, and it remains unchanged. Another …

Learn to determine if a relation given by a set of ordered pairs is a function. Created by Sal KhanandMonterey Institute for Technology and Education. Video transcript

Allow me to explain what a function is: f(x) means y. The f means: "we do this to x." f can be anything. It does not multiply the two variables, but it says to do something when x equals this. …