The image contains systems of linear equations. There are 20 problems, with sets of equations involving multiple variables (e.g., $x_1, x_2, x_3$, etc.). These problems seem to focus on solving for variables in simultaneous equations.

Would you like assistance solving any specific set of equations from this list? Let me know which problem you'd like help with, and I can provide detailed solutions and explanations!

Here are 5 questions related to systems of equations:

1. How do you solve a system of linear equations using substitution?
2. What is the elimination method, and when is it most useful?
3. How does Gaussian elimination work in solving systems of equations?
4. Can systems of equations have no solution, and how can you identify such cases?
5. What does it mean if a system has infinitely many solutions?

Tip: A consistent system of linear equations has at least one solution, while an inconsistent system has no solutions. You can identify this through methods like row reduction or by looking for contradictory equations.