You can write a linear function in the form 

-intercept. The graph is a straight line. Learn more in this video.

You can write a linear function in the form f(x) = mx+b, where m is the slope and b is the y-intercept. The graph is a straight line. Learn more in this video. 

A function is a relationship between two — or more — variables. If you input a number into a function, it can only output one value.

A type of function that can be written in the form 

, where m is the slope of the curve and b is the y-intercept. The graph of a linear function is always a straight line.

The ratio between the change in y coordinates and the change in x coordinates (rise over run). It describes the steepness of a line.

Tells you where the graph of a function intersects with the 

A tool for representing points using a pair of numerical values as coordinates. Consists of two axes, 

-axis and four sections called a quadrants.

The horizontal axis in a coordinate system

The vertical axis in a coordinate system. Often called 

. By plotting these in a coordinate system you can visualize the relationship between the input, 

, of the function. This is what we mean by drawing a graph.

Linear Functions

What Is a Linear Function?