Algebra-1

1. Recall the definitions of independent and dependent variables:

The independent variable is the variable that is being manipulated or changed in an experiment. It is the variable that the researcher (in this case, John) has control over.

The dependent variable is the variable that is affected by the change in the independent variable. It is the outcome that the researcher is interested in observing.

2. Analyze the situation:

John is interested in seeing how the amount of exercise he does affects his energy level. He can control the amount of exercise he engages in. He can choose to exercise more or less.