Question

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

Answer 1

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

Cost of notebook = 2 × Cost of pen x = 2y x − 2y = 0.