 as an equation. Learn more with this video.

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.

Tells you where the graph of a function intersects with the 

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

. 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.

Every point in the coordinate system has coordinates of the form 

. The first coordinate tells you where the point is along the 

-axis, and the second coordinate tells you where the point is placed along the 

The horizontal axis in a coordinate system

The vertical axis in a coordinate system. Often called 

Mathagon

Definition

Slope m and y-Intercept b

Draw the Graph

Finding the Slope, m

Finding the y-Intercept, b

Linear Functions

You find the y-intercept, b, by reading the y-value where the graph intersects the y-axis, or by using f(x) = mx+b as an equation. Learn more with this video. 

How Do You Find the y-Intercept, b?