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 cost of a notebook be denoted by \( x \).
• The cost of a pen be denoted by \( y \).

From the given information:

The cost of a notebook is twice the cost of a pen. This can be written as:

\[ x = 2y \]

This is the linear equation representing the relationship between the cost of a notebook (\( x \)) and the cost of a pen (\( y \)).