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 a notebook be x and that of a pen be y.

According to question,

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

SO, x = 2y
so, x - 2y = 0.

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Answer 2

Let the cost of a notebook to be = ₹ x

Let the cost of a pen to be = ₹ y

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

$x = 2y$

$x - 2y = 0$

x-2y = 0 is the linear equation in two variables yo represent the statement 'The cost of a notebook is twice the cost of a pen'.