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NCERT SOLUTIONS CLASS 9 MATHEMATICS

Exercise 4.1

Q.1. 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.2. Express the following linear equations in the form ax + by + c = 0 and indicate the values of a, b and c in each case: