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Quiz Review
3.1-3.3
Algebra II Unit 3 Linear Systems
© Tentinger
Solve by graphing
Solve by Substitution
Solve by Elimination
Find all whole number
solutions
Solve by graphing
• 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?
Homework
• Pg. 156
• #1-14, 16, 18

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