Question

A store sells books for $12 each. In the proportional relationship between x, the number of books purchased, and y, the cost per books in dollars” to “y, the total cost of the books in dollars, the constant of proportionality is 12. Which equation shows the relationship between x and y?

A: y = 12 - x

B: y = 12x

C: y = 12 + x

D: y = x under 12

P.S: 12/x to be exact

Answer 1

the answer would be (b:y=12x)
because say you have 5 books 5 is x so you would do 5 times 12 because 12 is the cost for each book, 12 times 5 equals 60. but that’s just a example, b is the correct answer.

Answer 2

B

Explanation:

we know it has to equal y(the total cost of books). We also know that each book is 12 dollars each. So 12 dollars per book =12x. We add in the y now,

y=12x