Mixed problems - choose your method

Solve using any method. State if there is a unique solution, no solution, or infinite solutions:

  1. y = 2x - 1
    3x + y = 9
  2. 2x + y = 5
    4x + 2y = 10
  3. x - 2y = 3
    x - 2y = 7
  4. 3x + 4y = 10
    2x - y = 1
  5. 6x - 3y = 9
    2x - y = 3

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