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

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

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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 

50\times 5 = 250            40\times 6 = 240                                                                             30\times 7 = 210            20\times 8 = 160,

clearly xy is not equal to a constant value 'k',

hence x and y are not inversely proportional.

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