Mathematics for IGCSE & O level - Proportion (Section 2 - No. 33)
Which of the following scenarios could represent the relationship between two variables that are inversely proportional?
The number of hours worked and the amount of money earned (hourly wage is constant).
The speed of a car and the time it takes to travel a fixed distance.
The number of items purchased and the total cost (cost per item is constant).
The height of a plant and the amount of sunlight it receives.
Giải thích
Inversely proportional means that as one variable increases, the other decreases. Speed x time = distance. If speed increases, time decreases.