![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
Observe the graph :
\The year is the independent variable because it is unaffected by the sales.
\The amount of sales is the dependent variable because it depends on the year.
\![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
The year is the independent variable.
\The amount of sales is the dependent variable.