Question

The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement.

(Take the cost of a notebook to be ₹ x and that of a pen to be ₹ y).

Answer 1

Let the price of the pen = ₹ y

and the price of the notebook = ₹ x

According to the question,

cost of notebook = 2 (price of the pen)

x = 2y

⇒ x − 2y = 0