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

Answer 1

Let the cost of pen b Rs. x 

If the cost of Notebook is Rs. y. 

Cost of 1 notebook is twice the cost of a pen. 

∴ y = 2x -2x + y = 0 

If this is written in the form of 

ax + by + c =, it is 

-2x + y + 0 = 0 

Here, a = -2, b = 1, c = 0.