
Concept explainers
To identify: The independent variable and dependent variable.

Answer to Problem 21E
The independent variable is number of quarters and dependent variable is amount of time.
Explanation of Solution
Given:
The amount of time fluctuates with number of quarters put in the parking meter.
The dependent variables are those variables that depends on another variable and changes accordingly. It provides output values for the function.
On the other hand, the independent variable is free from the dependency on the another variable and it is the input variable of the function.
In the given problemit can be observed that the amount of time is dependent variable as amount of time depend on the number of quarters that put in the parking meter.
The amount of time increases as number of quarters in parking meter increases and vice versa that means the amount of time is dependent on the number of quarters.
The number of quarters is independent variable as number of quarters does not depend on any other thing. Therefore, it is free to choose.
Chapter 3 Solutions
BIG IDEAS MATH Algebra 1: Common Core Student Edition 2015
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