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 $₹ y$ )

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Solution

Forming a linear equation:
Given: The cost of a notebook is twice the cost of a pen
Let,
The cost of a notebook $= ₹ x$
The cost of a pen $= ₹ y$
As per the given statement
The cost of a notebook $(x)$ is twice the cost of a pen $(y)$ .
$x = 2 y \Rightarrow x - 2 y = 0$
Therefore, $x - 2 y = 0$ is the linear equation in two variables that represent the given statement.

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