 Hi and welcome to the session. I'm Kanika and I'm going to help you to solve the following question. The question says the cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent the statement. Before solving this question, let's first understand that what is meant by a linear equation in two variables. Which can be put in the form AX plus BY plus C is equal to 0 where A, B and C are real numbers and B code 0 is called a linear equation in two variables. Let's now begin with the solution. Look at the question again. The question says the cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent the statement. Now here the cost of a notebook and cost of a pen are unknown. So let the cost of the notebook be rupees X, cost of pen rupees Y. Cost of a notebook is twice the cost of a pen. So according to this condition X is equal to the cost of a notebook is twice the cost of a pen. Or we can say that X minus 2Y is equal to 0. Clearly this is a linear equation in two variables. Therefore the required linear equation is X minus 2Y is equal to 0. This is our required answer. So this concludes the session. Bye and take care.