Algebra - solving linear equations w/ substitution

The question in the book reads:
"Suppose you try to solve a system of linear equations using substitution and get this result. How many solutions does each system have?"
I understand #3 and #6, but I do not understand how to know how many solutions there are to #1,2,3,or 5.

  1. 👍 0
  2. 👎 0
  3. 👁 204
  1. 1)one solution
    2)one solution
    4)infinite solutions
    5)one solution

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    2. 👎 0

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