1. Simplify Expressions 34
A number divided by 3 is 7.
n ÷ 3 = 7

2. Simplify Expressions 36 The sum of b and 8 equals 25. b + 8 = 25

3. Addition & Subtraction Equations

4. =
7 + 5 − 5 = 12 − 5 7 = 7

5. =
7 + 5 − 7 = 12 − 7 5 = 5

6. The sum of a number and 5 equals 8.
= 3
n = 3

7. the value of the variable that makes an equation true
solution
the value of the variable that makes an equation true

8. 4 + x = 15
4 − 4 + x = 15 − 4 x
= 11
= 15

9. Solving Addition & Subtraction Equations

10. n + 6 = 10
n + 6 − 6 = 10 − 6 n
= 4

11. 7 = 2 + n
7 − 2 = 2 − 2 + n 5
= n
n = 5

12. x − 4 = 2
x − = 2 + 4 x
= 6
6 − 4 = 2

13. a = 12
a + 10 = 12
a + 10 − 10 = 12 − 10 a
= 2

14. 9.4 − 2 + d = 13
d = 13
7.4 + d = 13
d − 7.4 = 13 − 7.4 d
= 5.6
9.4 − = 13

15. 6 13 8 13
z − = 6 13 6 13 8 13 6 13
z − = + 14 13 z = 1 13 z = 1

16. Addition & Subtraction Equations15
f − 17 = 9 f = 2.6 no
f = 26
2.6 f
− 17
= 9
f − = f
= 26

17. Complete #1−44 (even) on Student Text pp. 220−21.