1
Q
How can you tell if y is a function of x on a graph?
A
If the graph passes the VLT
2
Q
How can you tell if y is a function of x in an equation?
A
If the input has only one output,
input = 1,2,3 X input = 1 ✓
3
Q
(a,b) means …
A
a < x < b
4
Q
[a,b] means …
A
a ≤ x ≤ b
5
Q
(a,b] means …
A
a < x ≤ b
6
Q
x < 8 in interval notation
A
(-inft,8)
7
Q
x < 0 or x ≥ 3 in interval notation
A
(-inft,0) U [3,inft)
8
Q
-4 ≤ x < 4 in interval notation
A
[-4,4)
9
Q
0 < x or x < 8 in interval notation
A
ARN (-inft,inft)
