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7-21.
  1. Solve the system of equations below using the method of your choice. If there is not a solution, explain why. Homework Help ✎

    y = −x + 1
    y = −x – 2

Which method of solving a system should be used here, Equal Values Method, Substitution, or Elimination?

This is a no solution. Why is there no solution? How can you tell by looking at the equations?