Big Ideas Math: Modeling Real Life, Grade 6
BI
Big Ideas Math: Modeling Real Life, Grade 6 View details
4. Writing Equations in Two Variables
Continue to next subchapter

Exercise 34 Page 271

Which variable causes a change in the other variable?

Independent Variable: s
Dependent Variable: c

Practice makes perfect
We want to identify the independent and dependent variables of the given equation. c=0.09s This equation represents the amount c of commission a salesperson receives for making a sale of s dollars. To identify which variable is independent and which is dependent, we need to analyze which variable causes a change in the other variable.
  • Independent Variable: Causes change in the dependent variable.
  • Dependent Variable: Changes because of the independent variable.

The value of the sale causes the commission to increase . In other words, the commission c depends on the value of the sale s. Therefore, s is the independent variable and c is the dependent variable.