03 Jun Class 9 - Linear equations in two variables, Math - Class 9 | NCERTClass 9 math tutorials, geometric representation of a linear equation, graph of a linear equation, linear equations, linear equations in two variables, math, mathemafia, mathematics, NCERT, solution of a linear equation Question 1: The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement. Class 9 - Home Question 2 In this video, linear Equations, variables, constants are explained in detail with example and demonstration by plotting solutions on graph. This video is intended for class 9 and class 10 students.