Final answer:
Reducing is not a method for solving a system of linear equations. The correct methods are Graphing, Elimination, and Substitution.
Step-by-step explanation:
The method that is not used for solving a system of linear equations is Reducing. The correct methods for solving a system of linear equations are Graphing, Elimination, and Substitution.
Graphing involves plotting the equations on a coordinate plane and finding the point of intersection as the solution.
Elimination involves adding or subtracting the equations to eliminate one variable, allowing us to solve for the other variable.
Substitution involves solving one equation for one variable and substituting that expression into the other equation to solve for the other variable.