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Solving simultaneous linear equations by graphing

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Intros
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Lessons
  1. How to find the number of solutions to systems of linear equations?
  2. How to solve systems of linear equations by graphing?
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Examples
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Lessons
  1. Graph the following linear equations and find the point of intersection. State the consistency.
    1. 2x - y = - 9
      x + 3y = 6
    2. 2x + 2y = 8
      3x - y = 0
    3. 4x + 6y = 12
      2x + 3y = 9
    4. y - x = 2
      4y - 8 = 4x