1. Algebra 2 Schedule: Class Announcements Wednesday Warm-Up Homework Check/Questions 2.2 Notes Begin Homework

2. Wednesday Warm-Up 1) What is the greatest common factor of 42, 126, and 210 ? A. 2 B. 6 C. 14 D. 21 E. 42 2) Sales for a business were 3 million dollars more the second year than the first, and sales for the third year were double the sales for the second year. If sales for the third year were 38 million dollars, what were sales, in millions of dollars, for the first year? A. 16 B. 17.5 C. 20.5 D. 22 E. 35

3. 2.2 – Slope and Rate of Change Objectives: 1. Find the slope of lines. 2. Classify lines based on slope. 3. Use slopes in real life. Vocabulary: slope Algebra 2

4. Classify slopes: positive slopes negative slopes horizontal line  slope = 0 vertical line  no slope  undefined steepness = magnitude of slope direction = sign of slope m = -2 steepness direction “READ” SLOPES FROM LEFT TO RIGHT! Important:

5. Using Slopes rise run ___ = Vertical change Horizontal change _________ Estimate the slope of the line.

6. Meet Slope Man… - + u 0

7. How do I find slope? 1.Pick/label points & use formula. 2.Simplify. Find the slope of: M(-4, 5) and N(3, 15) rise – vertical change run – horizontal change Rising or falling? Steep or level?

8. How do I find slope? 1.Pick/label points & use formula. 2.Simplify. Find the slope of: P(0, -5) and N(4, -7) rise – vertical change run – horizontal change Rising or falling? Steep or level?

9. How do I find slope? 1.Pick/label points & use formula. 2.Simplify. Find the slope of: A(4, 16) and B(12, -8) rise – vertical change run – horizontal change Rising or falling? Steep or level?

10. Parallel Lines: same slopes  m 1 = m 2 Perpendicular Lines: opposite reciprocal slopes  Classify these lines based on their slopes: parallel neither perp. neither

11. Parallel Lines: same slopes  m 1 = m 2 Perpendicular Lines: opposite reciprocal slopes  Classify these lines based on their slopes: A(5, 7), B(10, 12) and C(3, -2), D(5, 0) E(3, 6), F(1, 2) and G(4, 1), H(0, 3) parallel perp.

12. In 1993 there were 16 million cell phones. In 1996 there were 44 million. What is the rate of change? 9.3 million phones per year At this rate, how many cell phones can we predict there to be today? Is this reasonable to believe? 192.7 million phones Mobile Phones

13. Find the slope of a slide that drops 8’ over a distance of 24’. You decide to make “The Slide of Death.” If you have the slide drop 54’ over 80’, what is the slope of the “The Slide of Death?”

14. Homework: pgs. 79-80 #18, 19, 23-25, 41, 42, 44 2.1-2.3 Quiz on Monday, September 17 th Algebra 2