Here are the answers in order from the provided document:

1. N/A
2. N/A
3. $x = 2, y = 3$
4. $x = 0, y = 4$
5. $x = 2, y = 1$
6. $x = 2, y = 2$
7. $(0, 1), (2, 2), (6, 0)$
8. Minimum value is 2
9. Maximum value is 12
10. $6c + 30b \leq 600$ and $c + b \leq 60$
11. $c = 50, b = 10$
12. $x = -1, y = 1, z = 2$
13. $a = -3, b = 1, c = 0$
14. $x = 1, y = -4, z = 5$
15. $a = 1, b = -1, c = 1$

Let me know if you want any details or clarifications on these answers!

Here are 5 additional questions based on this material:

1. What are the steps to solve a system of equations using substitution?
2. How do you graph a system of inequalities to find a feasible region?
3. What is the elimination method for solving systems of equations?
4. How are matrix equations solved using inverse matrices?
5. What are the applications of linear programming in real-world problems?

Tip: For solving systems of equations, the elimination method can be particularly useful when both equations are set up for easy cancellation of one variable.