Exercise 4.1 class 9 maths | Linear equations in two variables exercise 4.1 class 9

#mathsclass9 #rajansir Exercise 4.1 class 9 maths Exercise 4.1 class 9 maths by @rajansir07 #Class9Maths #Exercise4_1 #LinearEquations #MathsWithRajanSir #CBSEMaths #NCERTMaths #Class9CBSE #MathsTutorial #LearnMaths #NCERTSolutions #Class9LinearEquations #MathsMadeEasy #RajanSirMaths #BoardExamPreparation #CBSE2025 NCERT Solutions for Class 9 Maths Chapter 4 – 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 ₹ x and that of a pen to be ₹ y) Solution: Let the cost of a notebook be ₹ x Let the cost of a pen be ₹ y According to the question, The cost of a notebook is twice the cost of a pen. So, 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 representing the statement ‘The cost of a notebook is twice the cost of a pen’. 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: The equation 2x–5 = 0 can be written as, 2x+0y–5 = 0 Now comparing 2x+0y–5 = 0 with ax+by+c = 0 We get, a = 2 b = 0 c = -5