1. Warm-Up
Solve the system by substitution.

2. Notes Solving a System of Equations by Substitution
1. Solve one of the equations for x or y.
- Get x or y by itself.
2. Substitute your new expression from Step 1 into the other equation and solve for the variable.
3. Plug that solved variable into the other equation from Step 1 and solve for the other variable.
4. Check your answers by plugging it into the original equations.

3. Notes Solve the system by substitution. Ex. 1) Solve for x or y.
Step 3
2) Substitute into other equation.
3) Plug in answer into other equation.
4) Check answer!

4. Notes Solve the system by substitution. Ex. 1) Solve for x or y.
Now you try.
Solve the system by substitution.
Ex.
1) Solve for x or y.
Step 3
2) Substitute into other equation.
3) Plug in answer into other equation.
4) Check answer!

5. Notes Solve the system by substitution. Ex. 1) Solve for x or y.
Step 3
2) Substitute into other equation.
3) Plug in answer into other equation.
4) Check answer!

6. Notes Solve the system by substitution. Ex. 1) Solve for x or y.
Now you try.
Solve the system by substitution.
Ex.
1) Solve for x or y.
Step 3
2) Substitute into other equation.
3) Plug in answer into other equation.
4) Check answer!

7. Class Work
Solve the system by substitution.