Function Vocab
Evaluating Function Rules
Writing Function Rules
Graphing
Is it a Function?
100
True or False-A relation is a set of ordered pairs
TRUE
100
Evaluate f(x)=-3x if x=2
f(2)=-6
100
Given the points write a function rule (0,-2);(1,-1); (2,0)
y=x-2 of f(x)=x-2
100
The point (1,2) is in which quadrant?
1st quadrant
100
Is it a function? Why?
{(2, 3), (4, 5), ( -2, 6)}
YES because x does not repeat
200
The set of all inputs relation or a function
Domain
200
Evaluate f(x)=2x+1 if x=-2
f(-2)= -3
200
Given the points write a function rule (0,0); (1,3); (2,6)
y=3x or f(x)=3x
200
How do you graph the point (-3,4)?
Go left 3 units on the x-axis then go up 4 units on the y-axis
200
Using the vertical line test, does the graph of the points (1,3) and (1,5) represent a function? Why?
No, the points fail the vertical line test
300
The set of all outputs in a relation or a function
Range
300
Evaluate f(x)=-3 - x if x=6
f(6)= -9
300
Given the points write a function rule (0,0); (2,1); (4,2)
y=x/2 or f(x)=x/2
300
What are the signs of the x and y values in quadrant 2? (i.e. are each of them positive or negative?)
(negative, positive)
300
Is it a function? Why?
| x | y |
| 2 | 4 |
| 1 | 5 |
| 2 | 6 |
NO, because x repeats
400
A relation that assigns exactly one value in the range to each value in the domain.
Function
400
Evaluate f(x)=25 + 4x if x=5
f(5)= 45
400
Given the points write a function rule (-1,-1); (0,1); (1,3);(2,5)
f(x)=2x+1 or y=2x+1
400
What is the quadrant that doesn't contain one of these points (-2,3), (3,-4) (2,3)?
Third quadrant
400
Is it a function?
YES, because it passes the Vertical Line Test
500
What is the test to tell if a graph is a function?
Vertical Line Test
500
Evaluate f(x)=-(4x+2) if x=7
f(7)= -30
500
Given the points write a function rule (0,5); (1,6); (2,7);(-1,4)
f(x)=x+5 or y=x+5
500
What quadrant is the point (0,2) in?
None, it is on the y-axis
500
Is it a function? 
NO, because it does not pass the Vertical Line Test