1. Warm Up

2. Lesson 20, Graphing on a Coordinate Plane EXPRESSIONS AND EQUATIONS, FUNCTIONS

3. Vocabulary

4. Coordinate Plane  The coordinate plane has four quadrants.  The first quadrant contains all positive values  The second quadrant contains negative x values and positive y values  The third quadrant contains all negative values  The fourth quadrant contains positive x values and negative y values

5. Example

6. Variables  Independent variable : the variable whose value can be chosen  Dependent variable : the variable whose value is determined by the value of another variable

7. Example For each pair of variables, identify the independent variable and dependent variable. a. Number of traffic violations, cost of auto insurance b. Electric bill total, kilowatts of electricity used

8. Equations and ordered pairs

9. Example

10. Correcting homework  Be kind  Write “C.B. _____________” with your name  Hold questions until the end  Make sure I get your score sheet so your assignment is not marked missing!

11. Homework  1 st and 2 nd hour: Lesson 20 #1-30  3 rd hour: Lesson 19 #16-30  Test tomorrow! Don’t forget to study!