Lesson 8: Solving Systems by Elimination (Alg1.2.14)

Adding Equations

Diego is solving this system of equations:

Here is his work:

Make sense of Diego’s work and discuss with a partner:

What did Diego do to solve the system?
Is the pair of and values that Diego found actually a solution to the system? How do you know?

Does Diego’s method work for solving these systems? Be prepared to explain or show your reasoning. or

Adding and Subtracting Equations to Solve Systems

System A	System B	System C

For each system:

Use graphing technology to graph the original two equations in the system. Then, identify the coordinates of the solution.
Solve the system of equations by elimination and check your solution.