Three of these pairs of quantities are related by direct variation. Which pair is NOT?

A. x = hours traveled at 60 miles per hour, and y = total distance traveled

B. x = length of a rectangular table, in inches, and y = length of the table, in centimeters

C. x = number of $1-off coupons used, and y = amount saved

D. x = time it takes to travel 60 miles, and y = speed traveled

x = time it takes to travel 60 miles, and y = speed traveled

In A, traveled hours will be increased if the distance traveled is increased and hence it is in direct variation.

In B, both x and y represent the length of a table and the difference is in units only. So, it is also in direct variation.

In C, more number of $1-off coupons used, more money will be saved and hence it is also in direct variation.

In D, if the speed is increased, then the time to travel 60 miles will be decreased. Hence it is not in direct variation.