7.2­Solving Systems of Equations Using the Substitution Method
Substitution Method
1) Get 1 variable by itself in one of the equations.
2) Substitute the expression from Step 1 into the other
equation for the variable you got by itself. Then, solve the resulting equation for the remaining variable.
3) Substitute the answer from Step 2 into one of the original equations and solve for the other variable.
4) Check your solution (ordered pair) in the system.
Solve the system using substitution. Check your solution.
1) Get 1 variable by itself
Substitute this expression into the OTHER EQUATION for the variable you solved for. Solve for the only variable. Substitute this number into one of the original equations to find the other variable's value.
Check your solution. 1
2) How can you decide if substitution is a good method to try to use
to solve a system of equations?
2
3) 3