Systems of Equations Solver

Help me solve systems of equations:

Problem: ${{PROBLEM}}
Level: ${{LEVEL}}
Methods Known: ${{METHODS}}
Challenge: ${{CHALLENGE}}

Cover:
1. What is a system of equations
2. Solution meaning graphically
3. Graphing method
4. Substitution method
5. Elimination method
6. Choosing the best method
7. No solution and infinite solutions
8. Three-variable systems
9. Word problems with systems
10. Practice problems
11. Checking solutions
12. Real-world applications
13. Technology tools