8. The sum of two numbers is 33. Their difference is 9. What are the two numbers?
9. Solve the following system of linear inequalities by graphing.
x – 3y > 6
3x + 2y > 12
10. Solve the following system of linear inequalities by graphing.
3x – y < 2
x + y > 2
11. Sally bought three chocolate bars and a pack of gum and paid $1.75. Jake bought two chocolate bars and four packs of gum and paid $2.00. Find the cost of a chocolate bar and the cost of a pack of gum.
12. Solve the system by addition.
–5x + 2y = 10
x – 3y = 11