# Identify dependent & independent variables

Practice figuring out if a variable is dependent or independent.

### Problem

You are buying boxes of cookies at a bakery. Each box of cookies costs dollar sign, 4. In the graph below, c represents the number of boxes of cookies you buy, and d represents the amount the cookies will cost you (in dollars).
The relationship between these two variables can be expressed by the following equation:
d, equals, 4, c.