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In which of the following tables, a\ a n...

In which of the following tables, `a\ a n d\ b` vary directly. Also, find the constant of variation if `a\ a n d\ b` are in direct variation. (i) a, 4, 7, 21, 28 b, 12, 21, 63, 84 (ii) a, 2.5, 5, 7.5, 10, 15 b, 10, 20, 30, 40, 60 (iii) a, 1, 2, 3, 4, 5 b, 2, 1, 6, 3, 2/5

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(i) Table is in direct variation.
Constant of variation is `3`.

(ii) Table is in direct variation.
Constant of variation is `4`.
(iii) The table is not in direct variation.
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