This document summarizes key concepts and examples from an algebra 2 unit on linear systems. It outlines different methods for solving linear systems, including graphing, substitution, and elimination. It provides an example of a real-world linear system involving the costs of refrigerators over multiple years and finds the break-even point of 4 years where total costs are equal. Students are assigned homework problems applying these concepts.

1. Quiz Review
3.1-3.3
Algebra II Unit 3 Linear Systems
© Tentinger

2. Solve by graphing

3. Solve by Substitution

4. Solve by Elimination

5. Find all whole number
solutions

6. Solve by graphing

7. • An ordinary refrigerator costs $503 and has an estimated
annual operating cost of $92. An energy efficient model costs
$615 with an estimated annual operating cost of $64. Write a
system of equations to represent this situation.
• X - # of years, y – total cost of frig
• y = 92x + 503
• y = 64x + 615
• What is the solution to the system?
• (4, 871)
• What does the solution mean?
• The break even point is at 4 years
• Which model would you choose and why?

8. Homework
• Pg. 156
• #1-14, 16, 18