Think of linear as just a line. A linear function is one that, when graphed, forms a line. Linear functions are in the form: f(x) = ax + b, where a and b are constants.

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The standard form for linear equations in two variables is Ax+By=C. For example, 2x+3y=5 is a linear equation in standard form. When an equation is given in this form, it's pretty easy to find both …

Learn how to create a graph of the linear equation y = 2x + 7. Created by Sal Khan and CK-12 Foundation.

Finding the domain and range of a piecewise function where each segment is linear.

Linear functions are usually written in either slope-intercept form or standard form. We need a thorough and flexible understanding of these forms in order to approach many SAT questions about linear …

Learn to recognize if a function is linear. Created by Sal Khan and Monterey Institute for Technology and Education.

The solution of an equation with one variable is a number. How does the solution of a 2-variable equation look like? Well, it is an ordered pair. Learn more about it and how to test solutions to 2 …

A piecewise function is a function built from pieces of different functions over different intervals. For example, we can make a piecewise function f (x) where f (x) = -9 when -9 < x ≤ -5, f (x) = 6 when -5 < …

Explore linear functions and their applications with interactive lessons and practice exercises on Khan Academy.