
In countries like USA and Canada temperature is measured in Fahrenheit whereas in countries like India, it is measured in Celsius. Here is a linear equation that converts Fahrenheit to Celsius . If the temperature is what is the temperature in Celsius?

Important Points to Remember in Chapter -1 - Linear Equations in Two Variables from Telangana Board Mathematics Class 9 Solutions
An equation of the form where are real numbers such that and are not zero is called a linear equation in two variables.
2. A linear equation in two variables has infinitely many solutions.
3. Graphical Representation of Linear Equation in Two Variables:
(i) The graph of a linear equation in two variables is a straight line.
(ii) The equations of axis and axes are and respectively.
(iii) The graph of the equation is a straight line parallel to axis.
(iv) The graph of the equation is a straight line parallel to axis.
(v) Every point on the graph of a linear equation in two variables is a solution of the equation. Conversely, every solution of the linear equation in two variables represents a point on the graph of the equation.