Question

Which of the following quantities form a direct variation?

• A. Speed and time
• B. Number of workers and time taken
• C. Cost and quantity
• D. Length and area

Answer 1

The correct option is D Length and area

a) Increase in the speed decreases the time taken to travel a specific distance.
b) Increase in the number of workers decreases the time taken to do certain work.
c) Increase in the cost of a product decrease the quantity of the product bought for a particular amount.
d) Increase in the length increase the area of a region.
So, length and area form a direct variation.