The cost of a notebook is twice the cost of a pen. Write a linear equa

1.	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» 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.

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»

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.