traction are opposite operations and multiplication and division are oppo-
site operations.PRACTICE
Solve each of the following equations:- xþ 40 ¼ 62
- x 19 ¼ 32
- 8x¼ 56
- 23þx¼ 6
- x 6 ¼ 14
6.x
5¼ 2
- 109¼xþ 78
- 5x¼ 35
- xþ 8 ¼ 10
10.x
8¼ 3
ANSWERS
1. 22
2. 51
3. 7
4. 17
5. 8
6. 10
7. 31
8. 7
9. 18
10. 24
Solving Equations Using Two Principles
Most equations require you to use more than one principle to solve them.
These equations use the addition or subtraction principle first and then use
the division principle.EXAMPLE
Solve 8xþ 5 ¼37.138 CHAPTER 7 Expression and Equations