1. 4.1 Rate of Change and Slope
Take a look at Example #1 on page 187
What is the rate of change and what does it mean?
This means that it costs $39 per game.

2. Now try Check Your Progress 1A & 1B on page 188
Answers:
1A: 16/1
1B: 16 square inches of surface is tiled for each floor tile that is used.

3. Slope
Begin 29:27 or -13:13
End 35:03 or -7:37

4. Slope
Given the two points: (3, -5) & (-2, 7) find the slope of the line.
Negative slope means the line “Falls” or goes “Down the Mountain”
Positive slope means the line “Rises” or goes “Up the Mountain”

5. 1) Locate two points on the given line.
Determine how many units it takes to “rise” (positive) or “fall” (negative) to get to the level of the next point.
Determine how many units it takes to “run” (right = positive, left = negative) to reach the point. 2 1

6. Slope
Horizontal line has a slope of 0 (zero). Because zero divided by any number is still zero.
Vertical line has a slope of undefined. Because you can never divide by zero.

7. Find the coordinates given the slope
Find the value of r so that the line through (6, 3) and (r, 2) has a slope of ½.
cross multiply
Set the slope equal to the formula with the given points plugged in.
solve for r

8. Homework #26
Worksheet – Ducks
p , 44-47