Answer:
The answer is: Independent; Dependent
Step-by-step explanation:
In experimental sciences, dependent variables are dependent on the independent variables. The dependent variables represents the outcome or the output whose whose variation is being studied. Whereas, independent variables, also called regressors, represents the cause or the inputs, that is the potential reason for the variation.
Therefore, in the given example the changes in income is independent variable and frequency of eating out is dependent variable.