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

iii)

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 

90\times 10 = 900            60\times 15 = 900               45\times 20 = 900                   30\times 25 = 750            20\times 30 = 600                  5\times 35 = 175

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

hence x and y are not inversely proportional.

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