### Home > CC4 > Chapter 7 > Lesson 7.1.2 > Problem 7-21

7-21.

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?