what are the three methods used for solving systems of equations
Tutorial 20: Solving Systems of Linear Equations in Three Variables will cover systems that have three equations and three unknowns. We will look at solving them three different ways: graphing, substitution method and elimination method. This will lead us into solving word problems with systems, which will be shown in Tutorial 21: Systems of Linear Equations and Problem Solving.
1 Know if an ordered pair is a solution to a system of linear equations in two variables or not. 2  Solve a system of linear equations in two variables by graphing. 3  Solve a system of linear equations in two variables by the substitution method.  Solve a system of linear equations in two variables by the elimination method.