The power of linear equation is

A linear equation is called linear because the highest power of the variable is one. For example equations like 2x plus 3 equals 0 or y equals mx plus c are linear equations. If the power of the variable is two the equation becomes quadratic. If it is three it is cubic and if four it is quartic. Linear equations represent straight lines when drawn on a graph. They are widely used in algebra economics physics and engineering to model simple relationships. Therefore the power of a linear equation is always one which makes option A the correct answer.