Final answer:
The subject of this question is Mathematics, and it is about understanding the concept of independent and dependent variables.
Step-by-step explanation:
The subject of this question is Mathematics. In this context, the question is about understanding the concept of an independent variable and a dependent variable.
The independent variable is the variable that is controlled or manipulated, and the dependent variable is the variable that changes based on the value of the independent variable. It is important to correctly identify the independent and dependent variables when analyzing data or graphing a relationship between variables.