Direct Variation Answers

There are about 100 calories in 30 grams of Swiss cheese. Ruth ate 70 grams of this cheese. About how many calories were in the cheese that she ate if the number of calories varies directly as the weight of the cheese?

If 3 sandwich rolls cost $0.51, how much will 20 rolls cost?

If y varies directly as and y = 72 when x =3, what is the value of y when x = 6?

The variables x and y vary directly. Given the equation y = 2x , find the value of x wheny = 10.

If y varies directly as and y = 20 when x = 6, what is the value of y when x = 24?

Suppose y varies directly as x. If y = 7 when x = 28, what is the value of x when y = 3?

The distance D that a spring is stretched by a hanging object varies directly as the weight W of the object. If a 9-kg object stretches a spring 54 cm, find the distance when the weight is 2-kg. Round your answer to the nearest whole centimeter.

If y varies directly as the and y = 448 when x = 8, what is the value of y when x = 9?

The distance an object falls when dropped from a tower varies directly as the square of the time it falls. If the object falls 144 feet in 3 seconds, how far will it fall in 18 seconds?

If 2.2 pounds of a certain grain cost $1.54, how much will 5.7 pounds of the grain cost?