Lesson 12-1 Check Your Understanding ACTIVITY 12

Lesson 12-1
Representing Situations with Equations
ACTIVITY 12
continued
My Notes
Check Your Understanding
Write an equation for each situation. Show your verbal model and
define the variable you use.
5. What number do you subtract from 59 to get 31?
6. What number do you multiply by 10 to get 210?
7. What number do you divide by 12 to get 9?
8. Brynn needs to save $125 to build a doghouse for her new puppy.
She has saved $68. How much more does she need to save?
Identify each as an expression or an equation.
9. 8x − 3 = 5
10. 8x − 3
11. 2 = 4x
LESSON 12-1 PRACTICE
Write an equation for each situation. Show your verbal model and define
the variable you use.
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12. What number must be multiplied by 5 to get 35?
13. What number is subtracted from 12 to get 9?
14. The recycling club has a goal to recycle 2,000 pounds of newspaper
this year. They have already recycled 1,585 pounds. How many more
pounds do they need to recycle to meet their goal?
15. Reason abstractly. Mrs. Smith is having a graduation party for all of
the eighth-grade students in her school. She is making 120 cupcakes
to serve at the party. She needs to buy trays to hold the cupcakes. Each
tray will hold 24 cupcakes. How many trays will she need to buy?
16. Brynn can feed her puppy for $1.99 per week. How many weeks will
a bag of puppy chow last if it costs $11.94?
Identify each as an expression or an equation.
17. 4x
18. 14x + 2y + 3
19. 6x2 = 24
20. y − 5 = 2
Activity 12 • Equations
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