Final answer:
The relationship between the number of pages printed and the amount of ink used on a printer is a direct proportion.
Step-by-step explanation:
The relationship between the number of pages printed on a printer and the amount of ink used can be described as a direct proportion.
This means that as the number of pages printed increases, the amount of ink used will also increase in a predictable manner.
For example, if 100 pages are printed, it may use 10 units of ink, and if 200 pages are printed, it may use 20 units of ink.