Frank, a healthcare professional, needs to record the blood pressure levels of his patient and see the changes over a period of two months. Frank plots the blood pressure levels on the y-axis of the chart. Where does he plot the dates?

The dates show how the blood pressure changes over time, so they belong on the x-axis. The blood pressure levels are the values being measured and belong on the y-axis. Therefore, Frank should plot the dates on the x-axis.

AI-written and checked against the verified answer.