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Introduction to Euclid's Geometry
Question
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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.

Answer

Let the cost of a notebook be Rs x and the cost of a pen be Rs y.
Then, according to the given condition of the question,
x = 2y
⇒ x – 2y = 0
This is the required linear equation in two variables x and y.

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Some More Questions From Introduction to Euclid's Geometry Chapter

The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement.

 Express the following statement as a linear equation in two variables by taking present ages (in years) of father and son as x and y, respectively. Age of father 5 years ago was two years more than 7 times the age of his son at that time.