Question

12. If the number of articles purchased increases, the total cost also increases. It is a
case of
A.Direct Proportion
B.Inverse Proportion​

Answer 1

Answer:

a. direct proportion

Step-by-step explanation:

if a:b

and if a increases and b also increases

its direct proportion

Answer 2

If the number of articles purchased increases, the total cost also increases. It is a case of (A) Direct variation.

• Direct variation is the case when an increase in one quantity results in rising in another quantity also.

• Let x be any quantity and y be another quantity, and x and y are directly proportional to each other, then

              ⇒  x ∝ y

             ⇒    x = ky

        where 'k' is an arbitrary constant.

• An example of Direct variation is

         ⇒ The number of students taking admission to the school is

              directly proportional to the fees collected from them.