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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