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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 Rs x and that of a pen to be Rs y).

Linear Equations in Two Variables

Exercise 4.1

Ncert Solutions Class 9 Chapter 4 Linear Equations in Two Variables Exercise 4.1 Question 1
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Class 9

Linear Equations in Two Variables

Exercise 4.1

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 Rs x and that of a pen to be Rs y).

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) \(2x + 3y =9.\bar{35}\) 
(ii) \(x –\frac{y}{5} – 10 = 0\)
(iii) \(–2x + 3y = 6\)
(iv) \(x = 3y\)
(v) \(2x = –5y\)
(vi) \(3x + 2 = 0\)
(vii) \(y – 2 = 0\)
(viii) \(5 = 2x\)