The following are true of slope:

• It describes the steepness of a line.


• It can also be referred to as the rate of change.


• It can be written as a ratio that compares the change in the dependent variable to change in the independent variable,
  ΔyΔx
   .


• It can be positive, negative, zero, or undefined.


• It is represented algebraically by the variable, m, in the formula y = mx + b.


• It can be determined using the formula m = 
  y₂ - y₁x₂ - x₁
  when two points on a line are known.


• It can be determined using the sides of right triangles (slope triangles) on a graph.

Use this link below to further study an example of slope.

Slope Activity

Given the graph of y = x + 4, the y-intercept is 4.