2. Functions From Geometry
More Examples of Functions

3. 1
-20 1
-20
-20 1 1
-20
Rate of Change = Change in Y = -20 = -20 miles per gallon
Change in X
m = y2 – y1 = = -20 = -20
x2 – x

4. Think: What do I know?
there are 60 minutes in 1 hour
The situation gave me my information in miles per minute, so I will have to change my minutes to hours…..
2 miles = 0.05 miles per minute * 60 minutes = 3 miles per hour
40 min

5. (6, 500)
What is this graph a model of?
Slope is positive
Line does NOT start at 0,0, so I have a
starting value greater than 0
My y axis is counting by 50’s and my x axis is counting by 1’s
I can eliminate choice C since it represents a negative slope
M = 350 – 50 = 300
4 –
(0, 50)
$75 per month

6. +3 +3
+51
+51
Rate of Change = Change in y = 51 = 17 per dvd
Change in x 3 OR
M = = 51 =17 per dvd

7. (550,40)
(350,30)
(0,20)
(150,20)

8. 0-150 minutes: 20 -20 = 6 = 0 No Change
minutes: = 10 = $0.05 per minute
Customer pays $ 20 for the first 150 minutes and then $0.05 per minute for every minute after 150.