savannahcfrank2 savannahcfrank2

10-11-2017
Mathematics

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The variables x and y vary inversely. When y is 10, x is 10. What is x when y is 20

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choixongdong choixongdong

10-11-2017

inversely
y = k/x
k = yx
k = 10*10 = 100

when y = 20

20 = 100/x
20x = 100
x = 5

answer
x = 5 when y is 20

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