Identify the two quantities you are comparing
Find the change in the dependent quantity
Find the change in the independent quantity
Divide the change in the dependent quantity by the change in the independent quantity
Use the formula: rate of change = (y2 – y1) / (x2 – x1)
Keep units in the final answer
If the graph is a line, the rate of change is the slope
If the rate changes over time, compute it over the specific interval you need