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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).

Updated On: Jan 20, 2026
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Solution and Explanation

Let:

  • The cost of a notebook be denoted by \( x \).
  • The cost of a pen be denoted by \( y \).

From the given information:

The cost of a notebook is twice the cost of a pen. This can be written as:

\[ x = 2y \]

This is the linear equation representing the relationship between the cost of a notebook (\( x \)) and the cost of a pen (\( y \)).

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Questions Asked in CBSE Class IX exam

(Street Plan) : A city has two main roads which cross each other at the centre of the city. These two roads are along the North-South direction and East-West direction.

All the other streets of the city run parallel to these roads and are 200 m apart. There are 5 streets in each direction. Using 1cm = 200 m, draw a model of the city on your notebook. Represent the roads/streets by single lines. There are many cross- streets in your model. A particular cross-street is made by two streets, one running in the North - South direction and another in the East - West direction. Each cross street is referred to in the following manner : If the 2nd street running in the North - South direction and 5th in the East - West direction meet at some crossing, then we will call this cross-street (2, 5). Using this convention, find: 

(i) how many cross - streets can be referred to as (4, 3). 

(ii) how many cross - streets can be referred to as (3, 4).

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