Download Is this a function?

Warmups - Quiz
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Pencil and Calculators Only
Write your answers on the answer lines
Try with a Mathlete 1
Graph: x + 2y = 6
x
y
5-5 Functions
Objective: To identify a function and to
find the value of a function for a given
element of the domain.
Standard 16.0
Function
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Function: for every x, there is only 1 y.
or
your “x” cannot repeat
Is this a function?
Ordered pairs
(2,3)(3,0)(5,2)(-1,-2)(4,1)
Reason: no repeating x values
(3,4)(5,1)(3,-1)(0,6)
Reason: repeating x values
No
Yes
Is this a function?
Table
x
y
x
y
4
-1
1
-1
5
2
5
0
6
6
6
4
5
3
2
3
-1
1
-1
1
No
X repeats
Yes
Is this a function?
Map
3
4
-3
8
0
-6
10
Yes
0
-6
10
7
2
3
5
No
2 arrows
Is this a function?
Graph
Vertical line test – drag your pencil across the graph, if it ever touches
the graph in more than one spot, it is not a function.
Yes
No
Fails vertical line test
Not a function if:
x+y=3
y = x2 – 4
Yes
Yes
|y| + 3 = 6
No
2y + 4 = 0
Yes
y2 + x = 6
No
x=4
No
Not a function if:
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No - y2
No - “only x”
No - |y|
Homework
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5-4 Study Guide
Cool Down
Is it a linear equation?
No:
1. 3 + y = 2
x 4
2. x - 2y = 5
5
Denominator
Exponent
Multiply
3. 3y + 2 = 0
4. 8x - 7y = 2x - 5
5. 4x2 – 3x = y
6. 5xy = 30