1. |
2. |

3. |
Solve for |

4. Solve the following system of equations by

- a) Graphing
- b) Substitution
- c) Addition

and check your answer

5. Linda goes to visit a friend who lives in Lompoc. It is 390 miles from Linda's house to her friend's house. When she came back, it took her a half an hour less time and her average speed was 5 miles per hour faster. How fast was she going when she went down to Lompoc, and how fast was she going when she drove back?