Question

. If x and y are directly proportional, then which of the following is correct?



A. x+y=constant

B. x-y=constant

C. xy=constant

D. x/y=constant

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Answer 1

Step-by-step explanation:

option D

as x is proportional to y

x= ky. ( k is proportionality constant)

x/y = k

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Answer 2

Given:

x and y are directly proportional.

To Find:

The relation between x and y

Solution:

As x and y are directly proportional then,

⇒x ∝ y

where ∝ is the proportionality constant, to remove this constant we have to multiply y by a constant k.

So,

⇒ x=ky

⇒ x/y=k, (where k is a constant)

Hence, if x and y are directly proportional, then x/y= constant. (Option D)