NCERT Solutions Class 9 Mathematics Chapter 4 Linear Equations In Two Variables

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. Sol.1) Cost of a notebook = π‘₯ Cost of a pen = 𝑦 Then according to the given statement π‘₯ = 2𝑦 or π‘₯ βˆ’ 2𝑦 = 0 Q.2) Express the…