Question

Which of the following situations is an example of direct proportions ? The perimeter P of a square and its side length a The length l and width b of a rectangle, given the area remain constant The number of units of a product that can be purchased given a fixed amount of money and unit price of the product The number of rows m and the number of columns n in which a fixed number of marbles can be arranged.
Anyone tell me this one​

Answer 1

perimeter and side of square.

when side of square increase, perimeter also increase. so they are directly proportional.