Question

The cost of notebook is twice the cost of pen. Write linear equation.

Answer 1

Hey friend, ☺️ here is your answer ____________________________
Let the cost of the notebook be Rs. x
Let the cost of the pen be Rs. y

So the equation formed
x = 2y.

Hope this helps you.

Answer 2

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 Rs. x and that of a pen to be Rs. y).

Sol: Let the cost of a notebook = Rs x

            The cost of a pen = y

            According to the condition, we have

                            [Cost of a notebook] = 2 × [Cost of a pen]

            i.e.            [x] = 2 × [Y]

            or              x = 2y

            or              x – 2y = 0

       Thus, the required linear equation is × – 2y = 0.