2. 1. Mental Math:What is 5 % of 80?
2. A ring has a SALE price of $540. This was
30% off. What is the ORIGINAL price?
3. A bike is on sale for $150.00. This is 25% off
the regular price. What was the original price?
4. Write 3.4% as a fraction and
as a decimal number.
5. Write one-tenth of ten percent as a fraction,
decimal, and percent

4. Vocabulary

6. H
e
i
g
h
t
-2
y
-1
(0,4)
1
(4,0)
x
Time

7. The Cost of a Phone Call

8. What is a Relation?

10. Example 1:

12. Functions: A Short Video

13. Mappings

14. Example of a Mapping
Steps
1.
-3
0
3
6
2.
1
2
3
4
Draw ovals
List domain
3.
List range
4.
Draw lines
to connect

15. Create a mapping of the following relation and state
whether or not it is a function.
{(-4,-1) ; (-4, 0) ; (5, 1) ; (3, 9)}
-4
5
3
-1
0
1
9

16. Using the Vertical Line Test
Use the vertical line test to check
if the relation is a function only if
the relation is already graphed.
Hold a straightedge (pen, ruler,
etc) vertical to your graph.
2. Drag the straightedge from left
to right on the graph.
3. If the straightedge intersects
the graph once in each spot ,
then it is a function.
4. If the straightedge intersects the
graph more than once in any
spot, it is not a function.
1.
A function!
……….

17. function
Not a function
Not a function
function
……….

18. Function Rules f(x)..g(x)..h(x)

19. ……….

21. y = -3x + 2
y = -3(-1) + 2
y=3+2
y=5

23. 1a. Domain: {-4, -2, 3, 4} Range: {-2, 2, 1}
1b. Domain: {0, 1, 7} Range: {-6, 2, -4, 4}
2a.
2b.
Function
Not a Function
3a.
3b.
-4
-2
3
4
-1
2
1
0
1
7
-6
2
-4
4
Not a
Function

24. ……….

25. Practice
Steps
1. Sub in each domain value in one @ a time.
2. Solve for y in each
3. List y values in braces.

26. 1. y = 3x + 1
y = 3(-4) + 1
y = -12 + 1
y = -11
y = 3x + 1
y = 3(0) + 1
y=0+1
y=1
Ans. { -11, 1, 7}
y = 3x + 1
y = 3(2) + 1
y=6+1
y=7
2. y = -2x + 3
y = -2(-5) + 3
y = 10 + 3
y = 13
y = -2x + 3
y = -2(-2) + 3
y = 4 +3
y=7
y = -2x + 3
y = -2(6) + 3
y = -12 +3
y = -9

27. H
e
i
g
h
t
P
e
o
p
l
e
C
o
s
t
S
p
e
e
d
H
e
i
g
h
t
S
p
e
e
d
A. Cost of a laptop, past 10 years B. Drag racing before hitting tree
C. World Population, last 700 years D. Person's height during lifetime
E. 3-point shot
F. Running up, then down a hill