1. Mini Review

2. y= x + 1 y = -x + 3

3. The solution is (1, 2)

4. X + 2y = -2 -3x -6y = 6

5. There are infinitely many solutions

6. x + y = 2 y = 2x + 5

7. (-1, 3)

8. Solve the System y – 2x = -5 y – x = -3

9. (2, -1)

10. Solve the System 2x – y = -8 2x + y = 4

11. (-1, 6)

12. Solve the System x + 4y + z = 12 y – 3z = -7 z = 3

13. (1, 2, 3)

14. Solve the System x + y + 2z = 5 x + 2y + z = 8 2x + 3y – z = 1

15. (-7, 6, 3)

16. 2x – y = 9 5x + 2y = 27

17. (5, 1)

18. Solve the System 3x + 5y = 8 4x + 7z = 18 y + z = 3

19. (1, 1, 2)

20. y ≤ 2 x > 3

22. Graph the system of linear inequalities x ≥ 0 y ≥ 0 2x + y ≤ 4

24. Earning money You work at a grocery store. Your hourly wage is greater after 6:00 p.m. than it is during the day. One week you work 20 daytime hours and 20 evening hours and earn $280. Another week you work 30 day time hours and 12 evening hours and earn a total of $276. What is your daytime rate? What is your evening rate?

25. daytime = $6 evening = $8

26. Telethon During a recent telethon, people pledged $25 or $50. Twice as many people pledged $25 as $50. Altogether, $18,000 was pledged. How many people pledged $25?

27. 360