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# CBSE Class 8 Answered

Quantities x and y vary inversely and when x = 15, y = 6. Which of the following is not a possible pair of corresponding values of x and y.

(i) 10 and 9

(ii) 18 and 6

(iii) 5 and 18

Asked by Topperlearning User | 12 Dec, 2013, 04:02: AM
Expert Answer

Since x and y vary inversely, the product remains constant.

It is given that when x = 15, y = 6, therefore,

(i) Let x = 10 and y = 9

So,

Which is same as in (a), so it a valid pair of values.

(ii) Let x = 18 and y = 6

So,

Which is not same as in (a), so it not a valid pair of values.

(iii) Let x = 5 and y = 18

So,

Which is same as in (a), so it a valid pair of values.

Answered by | 12 Dec, 2013, 06:02: AM

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