The cost of a ball pen is Rs 3 less than half of the cost of a fountain pen. Write this statement as a linear equation in two variables.

Let the cost of a fountain pen be x

Let the cost of a ball pen be y

Then, According to the question,

y = $\frac{x}{2}-3$

y = $\frac{x-6}{2}$

2y = x - 6

x−2y = 6

Hence, the required linear equation in two variables is x−2y = 6