Direct Variation

Presentation

•

Mathematics

•

9th - 12th Grade

•

Hard

Amanda Boyd

Used 7+ times

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8 Slides • 5 Questions

Direct Variation

What is direct variation?

Direct variation describes a simple relationship between two variables . We say y varies directly with x (or as x , in some textbooks) if: y=kx. for some constant k , called the constant of variation or constant of proportionality

Examples of Direct Variation

The number of hours you work DIRECTLY impacts the amount of money you make
The amount of weight on a spring DIRECTLY impacts the distance the spring will stretch
The speed of a car DIRECTLY impacts the distance traveled in a certain amount of time.

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y varies directly with x. When y=3, x=9. Find x when y=12.

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y varies directly as x. When y=10, x=2. Find y when x=13.

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The weight of an object on Earth varies directly as the weight of the same object on the moon. A 300 pound object would weigh 48 pounds on the moon. How much would a 65 pound object weigh on the moon?

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The amount of money raised at a charity fundraiser is directly proportional to the number of attendees. The amount of money raised for five attendees was $100. How much money will be raised for 60 attendees?

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Fill in the missing value on the table

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Direct Variation

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