Question

The cost of a notebook is twice the cost of a pen. Write a linear equation in two variable to represent this statement.
( Take the cost of a notebook to be $Rs.x$ and that of a pen to be $Rs.y$ ).

Answer 1

Let the cost of a notebook be Rs. $x$ and that of a pen be Rs. $y$.

Given the cost of a notebook is twice the cost of a pen.

Then $x=2y$

or, $x-2y=0$.

This is the required linear equation in two variable.