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How to solve problems using direct, indirect, and joint variation

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
Is y = 2x direct, inverse, or joint variation?   show
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Is y = 10xz direct, inverse, or joint variation?   show
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Is y = 3/x direct, inverse, or joint variation?   show
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show Constant of variation is 1/13  
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show y = 1/13x  
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The amount of pollution varies directly with the population N of people. City A has a population of 620,000 and produces 360,000 tons of pollutants. How many tons of pollution should City B be expected to produce if it's population is 350,000?   show
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Find the constant of variation if y varies inversely with x and y = 12 when x = 8   show
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show y = 96/x  
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