RS Aggarwal Solutions for Class 6 Chapter 9 “Linear equations in one variable” The linear equations in one variable is an equation which is expressed in the form of ax+b = 0, where a and b are two integers, and x is a variable and has only one solution. For example, 2x+3=8 is a linear equation having a single variable in it. A statement of equality which involves one or more variables, is called an equation. An equation in which the highest power of variables is 1 is called a linear equation. Other concepts which are talked about in this chapter are solving a linear equation by the trial and error method, systematic method for solving an equation, transposition and applications of equations.