Direct Variation

The phrase "y varies directly with x" means a relationship is a direct variation.

The amount a store earns varies directly as the number of hours. A local store takes in $11,500 in a 4 hour period. Estimate how many hours it would take the store to earn $23,000

Suppose y varies directly as x. If x = 24 when y = 8, find y when x = 33.

The number of apples sold varies directly as the cost. If 4 apples cost $0.45, find the cost of 12 apples.

The size of a box varies directly as its mass. A 20 cubic centimeter box has a mass of 40 kg. What is the size of the box if the mass is 100 kg.

Suppose y varies directly as x. If y = 150 when x = 3, find y when x = 5.

On a scale, yards vary directly as feet. If 3 feet represent 30 yards, how many yards represent 5 feet.

The number of books sold varies directly as the cost of the books. If 8 books cost $10.40, how many books can be bought for $32.50?

The number of days worked varies directly as the amount earned. If a woman earns $805 for 7 days, how many days does she have to work to earn $1840?