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 Description  
 Direct Proportion (Direct Variation):  The relation between two quantities whose ratio remains constant.
When A changes, then B changes by the same factor: A=kB, where k is the constant of variation and can have any value other than 0.

Example:
The amount of money that a worker earns (salary) is directly proportional to how many hours worked:

Salary = Amount Paid Per hour * Hours Worked

The Amount Paid per Hour is the constant of variation.
Salary = $16.00 * 40 hrs = $640.00.

Direct Variation can be expressed as an equation like above or in table format. For the above example, the following table shows the relationship between Hours Worked and Salary.

 Hours Worked  Salary
 1  16
 2  32
 3  48
 4  64