Question

The diagram below shows the relationship between the number of cans of chemical A and the number of cans of chemical B needed to form a chemical mixture.



In the equations below, y represents the number of cans of chemical B, and x represents the number of cans of chemical A. Which equation represents the proportional relationship in this diagram?
A. y = 2.5x

B. x = 2.5y

C. y = 1.5 + x

D. x = 1.5y

Answer 1

explain

Answer 2

The answer is A. y = 2.5x. This equation represents a proportional relationship because the number of cans of chemical B is directly proportional to the number of cans of chemical A, with a ratio of 2.5.

Answer 3

In a proportional relationship, two quantities are related in such a way that they always have the same ratio or proportion. In this case, the diagram shows that as the number of cans of chemical A increases, the number of cans of chemical B also increases.

The equation y = 2.5x represents this relationship because it states that the number of cans of chemical B (y) is equal to the number of cans of chemical A (x) multiplied by 2.5. This means that for every increase of 1 can of chemical A, there will be an increase of 2.5 cans of chemical B.

Option B (x = 2.5y) does not represent a proportional relationship because it states that the number of cans of chemical A is equal to the number of cans of chemical B multiplied by 2.5. This means that for every increase of 1 can of chemical B, there will be an increase of 2.5 cans of chemical A, which does not match the information given in the diagram.

Option C (y = 1.5 + x) and option D (x = 1.5y) do not represent proportional relationships either because they include addition or subtraction (option C) and division (option D) in addition to multiplication. In a proportional relationship, the two quantities are only related by multiplication or division.