Question

no.of books and their cost are said tobein_variation​

Answer 1

Hey Mate!

Here is your answer :

Number of books and their cost is said to be in DIRECT variation.

How?

Because, as the number of books increase, their price/cost also increase. So, they are in DIRECT variation :)

Hope it helps.

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Answer 2

it is in direct variation

because.......

when books will increase their cost will also increase.

thank you