Question

The cost of q notebook is thrice the cost of pen (if pen cost x and not book is y) Write a linear equation in two variables to represent this statement​

Answer 1

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Let the cost of a notebook be Rs. x and that of a pen be Rs. y.

Given the cost of a notebook is twice the cost of a pen.

Then

x=2y

or,

x−2y=0

.

This is the required linear equation in two variable.

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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

$\longrightarrow{x = 2y}$

$\longrightarrow{x - 2y = 0}$

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'.