How do you Identify linear functions and equations?

To identify linear functions and equations, look for a constant rate of change between the variables, which means the graph will form a straight line. The general form of a linear equation is (y = mx + b), where (m) is the slope and (b) is the y-intercept. Additionally, the function must not have variables raised to any power other than one, nor should it include products of variables or any non-linear terms. If the relationship between the variables can be expressed in this form, it is a linear function.