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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). Q.1

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Find the best solution of  chapter linear equations in two variables of ncert class 9th give me the best solution of exercise 4.1 question number 1. Please help me to find the easiest solution of this 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 ₹ x and that of a pen to be ₹ y).

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  1. Solution:

    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 = 2×y

    x = 2y

    x-2y = 0

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

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