Identifying Functions

Identifying Functions

Remember!

• Coordinate points are always written (x, y)

• In (3, 8), x = 3; y = 8

• In (-2, 4), x = -2; y = 4

Multiple Choice

What variable ALWAYS comes first in a coordinate point?

• Y

• X

Multiple Choice

What is the x-value of (7, 5)?

• 7

• 5

Multiple Choice

Which coordinate point has a y-value of 6?

• A. (6, 1)

• B. (1, 6)

Multiple Choice

Which coordinate points has an x-value of 3?

• A. (3, 5)

• B. (5, 3)

Multiple Choice

What is the y-value of the point (0, 9)?

• 0

• 9

Function

• A relation is a group of coordinate points.

• In order for a relation to be considered a function, each input must have only one output

• That's a fancy way of saying that x can't have two different y's

Multiple Choice

Which input (x) makes this relation NOT a function?

• 3

• 4

• 5

• 10

Multiple Choice

Which x-value makes the relation below NOT a function?

• 3

• -2

• 0

Multiple Choice

Which x-value makes this NOT a function?

• 5

• 8

• 2

Multiple Choice

Which x-value makes this relation NOT a function?

• 4

• 9

Multiple Choice

Is the relation below a function?

• Not a function

• Function

Multiple Choice

Is the relation below a function?

• Not a function

• Function

Multiple Choice

Is the relation below a function?

• Function

• Not a function

Multiple Choice

Is the relation below a function?

• Function

• Not a function

Multiple Choice

Is the relation below a function?

• Function

• Not a function

Mapping Diagram

• Just another way to see coordinate points!

• This one includes the points (2, 20) (2, 30) (4, 40) and (3,30)

• Your INPUT cannot repeat!

Multiple Choice

Which input makes this relation NOT a function?

• -5

• 1

• 0

• 6

Multiple Choice

Which input makes this relation NOT a function?

• a. -1

• b. 1

• c. 2

• d. 3

Multiple Choice

Is the relation below a function?

• Function

• Not a function

Multiple Choice

Is the relation below a function?

• Function

• Not a function

Multiple Choice

Is the relation below a function?

• Function

• Not a function