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Which of the following is the correct linear equation in two variables for the following statement?

The cost of a notebook is twice the cost of a pen. (Take the cost of a notebook as $Rs . x$ and the cost of a pen as $Rs . y$ ).

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x = 2 y

y = 2 x

x + 2 y = 0

None of the above

answer is A.

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Detailed Solution

Given, cost of a notebook is twice the cost of a pen.
According to the question,
The cost of a notebook is twice the cost of a pen.
i.e. Cost of a notebook = 2

×

cost of a pen
Let the cost of a notebook =

Rs . x

and the cost of a pen =

Rs . y .

∴ x = 2 y

Therefore, the linear equation in two variables for the given statement is

x = 2 y .

So, option (1) is correct.

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