Direct and Inverse Variation

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Identify two ordered pairs that would form a direct variation.

The number of calories burned while jogging varies directly with the number of minutes spent jogging. If George burns 150 calories by jogging for 20 minutes, how many calories does he burn by jogging for 30 minutes?

For a group of objects made of the same material, the weight of an object varied directly with its volume. If an object has a volume of 20 cubic inches and weighs 28 ounces, what is the constant of variation?

On a ski lift, the distance between chairs is inversely proportional to the number of chairs. At a ski resort, one lift has 80 chairs spaced 60 meters apart. What is the constant of variation?

(6,4.5), (8,6), (10,7.5)

• Direct

• Inverse

• Neither

• Both

Is the given table a direct or inverse variation? What is the constant of variation?

• Direct, 12

• Inverse, 12

• Direct, 1/12

• Inverse, 1/12

Determine the type of variation:

• Direct

• Inverse

• Neither