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).

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#### Solution

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

Cost of notebook = 2 × Cost of pen

*x* = 2*y*

*x* − 2*y* = 0

Concept: Linear Equation in One Variable

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