1. Unit 4B Study Help

2. Choose the equation… A pack of gum $1.79. Jessica purchased 4 packs of gum to sneak into Dr. Brantley’s class. (Obviously she doesn’t know Dr. Brantley’s gum-detecting abilities…) 4 = 4x y = 1.79(4) 1.79 = k (4) 4 = 1.79k

3. Choose the equation… Amber’s mom writes a check for $52.50. This will buy 35 lunches. Which equation represents the situation? y = 35(52.50) 35 = 52.50x 52.50= k (35) x = 35+52.50

4. Choose the equation… A candy bar costs $1.49. Jessica purchased 12 candy bars to give to her friends. 12 = 1.49k 12 = 12x 1.49 = k (12) y = 1.49(12)

5. Choose the equation… Amber’s mom writes a check for $74.75. This will buy 25 lunches. Which equation represents the situation? x = 25+74.75 25 = 74.75x y = 25(74.75) 74.75= k (25)

6. Does this graph represent y=kx?

11. Use the equation y=kx to find the missing value Find x when k = 9, and y = 36 Find x when k = 8, and y = 72 Find y when k = 8, and x = 3

12. Choose the equation… A candy bar costs $1.99. Jessica has $15. Which inequality represents the number of candy bars Jessica can purchase? x + 1.99 > 15 1.99x ≥ 15 x ÷ 1.99 ≤ 15 1.99x < 15

13. Write an equation that represents the relationship between x and y xy 26 412 515 824 x2457 y6101216

14. BE CAREFUL – you MUST evaluate the inequality first!!!!! Which is NOT a possible solution for the inequality 6y ≤ 72? a)10 b)11 c)12 d)13

15. BE CAREFUL – you MUST evaluate the inequality first!!!!! Which is NOT a possible solution for the inequality 5x < 105? a)21 b)20 c)19 d)18

16. BE CAREFUL – you MUST evaluate the inequality first!!!!! Which is a possible solution for the inequality 4x ≥ 64? a)4 b)12 c)13 d)24

17. BE CAREFUL – you MUST evaluate the inequality first!!!!! Which is a possible solution for the inequality 12x > 72? a)7 b)6 c)5 d)4

18. Scott earns $15.00 per hour working for Gulfstream. Complete the table to represent the relationship between his pay and the time he works. Write an equation that represents the relationship between the hours worked and money earned. Use y=kx What is the constant of variation? What is the independent variable? What is the dependent variable? Hours (x)01234 Wages (y)0

19. Graph the inequality n ≥ -2 n > 4 n ≤ 0 n < 5 Graph each inequality

20. Write an inequality for each graph