1. Rate of Change

2. Symbol for R.O.C is “a”
The rate of change is the rate at which a graph changes its line.
Rate of Change can be +, -, or 0
Positive Negative Zero
Rate of change means… rise
run

3. a = y2 – y1 x2 – x1 How to Calculate the R.O.C a = change in “y”
The R.O.C is the quotient of the change in the dependent variable and the change in the independent variable.
How to Calculate the R.O.C
a = change in “y”
change in “x
Formula for R.O.C.
a = y2 – y1
x2 – x1

4. Example: A(3,2) B(5,10)
Step 1 write down your coordinates and label them
(3,2) (5,10)
x1 y x2 y2
Step 2 write the formula and plug in the numbers
a = y2 – y1
x2 – x1
a =10 – 2
5 – 3
a = 8 2
a = 4 the rate of change

5. Practise: Calculate the r. o. c
Practise: Calculate the r.o.c. You must show all steps to solve for “a”
(0,0) and (4,12) 3 (1,8) and (5,40) 8 (1,7) and (6,42) 7 (-3,4) and (3,7) 1/2 (20,3) and (31,6) 3/11 (2,22) and(5,10) -4 (-5,5) and (-1,-1) -3/2 (-2,6) and(3,4) -2/5 (0,6) and (5,1) -1 Leave answers as fractions

6. Workbook page 102 Activity#1c 103 #1c,d 105 Activity #4,5(make a table of values first), #6,7 Finish to end of #5 for homework Use your notes…show all work..leave the rate of change as a fraction. Be good workers if you want to use the technology in math class !!!!!

7. Textbook #2 page 85 #1,2,3,4 88 # 1 a,b,c,d 2a,b,c,d 89 #4 b,d
When finished the workbook..begin…
Textbook #2 page 85 #1,2,3,4
88 # 1 a,b,c,d
2a,b,c,d
89 #4 b,d
90 # 6 a,b,c
#7 a,b,c,d,e

8. Correct homework
Workbook page 97 #3
98 #1
99 #3
100 #4,5