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The cost of a notebook is twice the cost...

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).

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Let cost of a notebook is `x` Rs and cost of a pen is `y` Rs.
Then, the linear equation will be,
`x = 2y`
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