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Rate of Change from Graphs
供稿人: Ferrazzi
(原作者: Roberts)
RATE OF CHANGE
Zero
Positive
can be
Undefined
Negative
RATE OF CHANGE
change  in  y
change 
  in x
m=
change in y
change in x
What is the
rate of change?
What is therate of change?
What is the 
rate of change?
What is the 
rate of change?
-3
3
0
Undefined
2
-2
0
Undefined
What is the 
rate of change?
2/3
-2/3
3/2
-3/2
What is the
rate of change?
m=
RATE OF CHANGE
always simplify your fractions
change in y
change in x
=
8
2
=4
What is the 
rate of change?
What is the 
rate of change?
What is the rate of change?
Use integer-points 
(not decimal points)
RATE OF CHANGE
good
bad
What is a good 
point to use?
use this
use this
use this
use this 
this
this
this
What is a good 
point to use?
this
(0,0)
(0,2)
(2,0)
What's a point?
What is a good 
point to use?
What's the 
rate of change?
3
4
5
6
What's the rate of change?
-5/7
-1
-3/4
-2/3
What's the rate of change?
RATE OF CHANGE
100
100
150
50
Watch your scaling!
0
1
2
 2
3
4
$20
$10
$15
$5
 1    2   3    4    5
days
What is the
rate of change?
1/2
5
5/2
2/5
miles
ran
What is the rate of change?
2
1
3
10
2
5     10    15   20   25   30
minutes
1/2
1/10
What
is the
rate of
change?
400
200
800
600
10     20    30    40
240
180
120
60
What is the rate of change?
3     6     9     12    15   18   21
change in x
    change in y
What is the formula
for rate of change?
change in y
    change in x
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