Which Methods Can Be Used To SolvebA System Of Linear Equation

Can Someone Help Me Plz

graphing
substitution
addition/subtraction

The two of which I know and understand are substitution (solve one equation for one variable, substitute the result for that variable in the other equation) and elimination (multiply, if necessary, one equation by a scalar, and then add or subtract it to the other to eliminate one of the variables in the other).

Descriptions of both can be found here: