Question

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

Answer 1

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

According to the question, the cost of a notebook is twice the cost of a pen.

$\therefore x=2y$

$\Rightarrow x-2y=0$

Hence, $x-2y=0$ is the equation in two variables that represent the given statement.