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INSTRUCTORS Carleen Eaton Grant Fraser Eric Smith
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For more information, please see full course syllabus of Algebra 1
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Lecture Comments (3)

2 answers

Last reply by: Daniel Delapena
Wed Dec 14, 2011 11:39 PM

Post by julius mogyorossy on August 23, 2011

I think the solution for example 2 might be wrong, just so you know.

Solving by Addition and Subtraction

  • If no coefficient is 1 or –1, use the addition and subtraction method. If you can add or subtract the equations and get one variable to vanish, then just solve for the remaining variable. This called elimination.

  • Use this method if the coefficients of one of the variables have the same or opposite signs in the two equations.

Solving by Addition and Subtraction

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Fundamental Principle 0:18
    • Adding or Subtracting
  • Lecture Example 1 1:23
  • Lecture Example 2 4:03
  • Additional Example 3
  • Additional Example 4