Rates of Change
What is a rate of change?
A rate of change is a measure that describes how much y changes relative to x. The y variable represents the dependent variable and the x variable represents the independent variable.
Note that this measure can be either positive or negative. A positive value signifes an increase in the y value between two x values. A negative value signifes a decrease in the y value between two x values. A zero value signifes that the y value does not change over time (i.e. between the two x values).
Equation of
Rates of Change
Rate of change = change in y divided by change in x 
Example of
Rates of Change
Find the rate of change based on the values in the table. 
1) Write the formula for the rate of change
Rate of change = change in y divided by change in x
2) Plug in the corresponding values
Rate of change 
Practice Problems of Rates of Change
1. Find the rate of change based on the values in the table. 
Take Home Points of Rates of Change
• A rate of change is defned by the change in y over change in x
• The y variable is the dependent variable
• The x variable is the independent variable
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