Observe the given table and find which pair of variables (here x and y) are in inverse proportion.

ii)

Answers (1)

Finding if x and y are in inverse proportion:

Two quantities x and y are said to vary in inverse proportion, if there exists a relation of the type xy = k between them, k being a constant

so, calculating xy for each case,

we have 

100\times 60 = 6000            200\times 30 = 6000                                                                300\times 20 = 6000            400\times 15 = 6000,

clearly xy is equal to a constant value 'k=6000',

hence x and y are inversely proportional.

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