Question

1. The cost of a notebook is twice the cost of a pen. Write a linear 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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Answer 1

$\huge \mathfrak \red{answer}$

$\bf{ \huge{ \underline{ \boxed{ \green{ \tt{x - 2y = 0 \: }}}}}}$

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$\sf \huge \underline{Question}$

The cost of a notebook is twice the cost of a pen. Write a linear 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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$\sf \underline{step \: by \: step \: explanation}$

$\rm{⟹let \: cost \: of \: book = \: rupees \: x}$

$\rm{⟹cost \: of \: pen = rupees \: y}$

$\tt \underline{given \: that}$

cost of notebook is twice..

$\rm{⟹cost \: of \: notebook = 2 \times \: cost \: of \: pen}$

$\rm \red{⟹x = 2y}$

$\rm \red{⟹x - 2y = 0}$

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x-2y=0 is linear equation in two variables

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what is linear equation?

• A linear equation in one variable is an equation that can be wriiten in the form

• ax+b=0

• where a and b are real numbers then and a is not equal to zero

I hope it's help uh

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'.