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*Class 9 CBSE Guide NCERT Solutions > 9th NCERT Mathematics Guide*

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**Class
IX, CBSE Guide NCERT Solutions**

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**Linear Equations in Two Variables**

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*NCERT Solutions of Class 9 Mathematics Exercise
4.1 *

*NCERT Solutions of Class 9 Mathematics Exercise 4.1*

*Question.1: The cost of a note book is twice the cost of a pen. Write a linear equation in two variables to represent this statement.*

*(Take the cost of a note book Rs x and that of a pen Rs y)*

__Solution__:

Cost of

*cost of a note book Rs x*and*cost of a pen Rs x.**By given condition, x = 2y*

⇒

*x - 2y = 0 is the required linear equation.**Question.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 :*

*(i) 2x + 3y = 9.35*

*(ii) x - y/5 - 10 = 0*

*(iii) -2x + 3y = 6*

*(iv) x = 3y*

*(v) 2x = -5y*

*(vi) 3x + 2 = 0*

*(vii) y - 2 = 0*

*(viii) 5 = 2x*

__Solution__:

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