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For more information, please see full course syllabus of GRE/ACT/PSAT Math
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Systems of Equations

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
  • The Basics: Systems of Equations 0:19
    • Equations with Infinite Solutions
    • Number of Equations Should Match the Number of Unknowns
  • Why Manipulation and Combination is Often the Best Method 4:34
  • Why Addition and Subtraction of Equations is Valid 7:23
  • The Most Important Step--The Common Coefficient 10:41
  • Manipulation and Combination: Steps 13:50
  • Substitution 15:49
  • Which Method Should Be Used? 20:13
  • How to Solve Problems with Three Equations and Three Unkowns 22:58
  • Three Equation Example 24:22