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Math 9_Q2-Mod.1:Direct & Inverse Variations
Quiz by Dona Aquino
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1. The intensity 𝐼 of light produced by a light source varies inversely as the square of the distance 𝑑from the source is written as
2. The number of kilograms of water 𝑤 in a person’s body varies directly as the person’s mass 𝑚 is written as
3. Which is an example of direct variation?
4. If 𝑦 varies directly as 𝑥 and 𝑦 = 30 when 𝑥 = 5, find the constant of variatio
5. Which is an example of inverse variation?
6. If 𝑦 varies inversely as 𝑥 and 𝑦 = 6 when 𝑥 = 12, find the constant of variation.
7. Which of the following describes a direct variation?
8. Which of the following describes an inverse variation?
9. Which variation statement describes the graph below?
10. Which variation statement describes the graph below?
11. Which variation statement represents the table of values below?
12. Which mathematical equation represents the table of values below?
13. If 𝑦 varies directly as 𝑥 and 𝑦 = 120 when 𝑥 = 8, find 𝑦 when 𝑥 = 10.
14. If 𝑦 varies directly as 𝑥 and 𝑦 = 4 when 𝑥 = 10, find 𝑥 when 𝑦 = 12.
15. If 𝑦 varies inversely as 𝑥 and 𝑦 = 14 when 𝑥 = 3, find 𝑦 when 𝑥 = 6.
17. The amount of money raised at a charity fundraiser is varies directly to the number of attendees. The amount of money raised for five attendees was P 1000. How much money will be raised for 60 attendees?
18. The number of days to construct a house varies inversely as the number of workers. It takes 10 days for 6 workers, how many workers is needed to finish the job in12 days?
19. The time it takes to travel from Marikina City to Baguio City varies inversely as the speed of the car. If the travel takes 5 hours at an average speed of 80kph, how long would it take travel at an average speed of 40 kph?
20. On a map, distance in km and distance in cm varies directly, and 25 km are represented by 2 cm. If two cities are 8 cm apart on the map, what is the actual distance between them?