1. Algebra 1 Section 4.4 Find the slope of a line Graph the line 2x – 3y = 12 The slope of a line = = Find the slope of the line passing through the points (1,2) and (4,-3)

2. Find the slope of the lines.

3. Slopes of lines The larger the absolute value of the slope, the steeper the line.

5. Create lines with the following slopes Slope = 1 Slope = -1 Slope = ½ Slope = 2 Slope = -3 Slope = undefined Slope = 0 Slope = 5 Slope = -5

6. Consider the slope of a line through two points The slope of a line containing the points (x 1,y 1 ) and (x 2,y 2 ) is given by: m = y 2 – y 1 x 2 – x 1

7. Find the slope of the line that passes through the points (6,2) and (8,5). (-6,9) and (2,0 ) (4,8) and (4,-2) (3,-1) and (7,2) (3,9) and (6,9)

8. Find the value of y if the slope of the line through (6,1) and (2,y) is ½. Slopes are also called average rates of change. A rock is dropped off a tall building. After 2 seconds, its height is 350 ft. After 5 seconds, its height is 60 ft. Find its average rate of change. In 1900, the population of Assaria was 1400. In 2000, the population was 1200. Find the average rate of change.

9. assignment Page 230 Problems 12-34 even, 38-48 even, 35,36,37, 55,57,58,62,84,90