Answer:
A. The dependent variable is a.
Step-by-step explanation:
As per the definition the dependent variable is that type of variable whose value depends on the other variable.
In the equation given in the question [tex]a=9b[/tex], a is a dependent variable because it's value depends on the value of b. In this equation 9 is a constant and as its value does not change while changing the value of other entities.
