Wed. Feb 24 Functions

Which of the following sets of ordered pairs is a function?

• {(8, 1), (7, 0), (7, -1), (8, 2)}

• {(6, 1), (7, 3), (4, 2), (6, 2)}

• {(1, 3), (2, 4), (-1, -3), (-2, -4)}

• {(-2, 4), (-2, 3), (-2, 2), (-2, 1)}

Tags

CCSS.8.F.A.1

The ordered pairs in the sets shown below are of the form (x, y). In which set is y a function of x?

• {(1, 3), (3, 1), (3, 4), (4, 3)}

• {(1, -2), (1, 0), (1, 5), (1, 7)}

• {(0, 3), (1, 4), (2, 4), (2, 8)}

• {(1, 3), (2, 6), (3, 1), (6, 3)}

Tags

CCSS.8.F.A.1

Which of these pairs of the form (x, y) could not lie on the graph of a function of x?

• (1, 1) and (3, 1)

• (1, 1) and (2, 2)

• (1, 1) and (1, 2)

• (1, 1) and (2, 1)

Tags

CCSS.8.F.A.1

The ordered pairs in the sets shown below are of the form (x, y). In which set of ordered pairs is y NOT a function of x?

• {(2, 0), (4, 1), (6, 2), (8, 3)}

• {(1, 4), (2, 4), (3, 4), (4, 4)}

• {(11, 2), (12, 4), (10, 5), (13, 6)}

• {(-6, 37), (-5, 20), (-6, 10), (-5, 26)}

Tags

CCSS.8.F.A.1

Label the following set of ordered pairs as either a function or a non-function.

{(7, -1), (7, -2), (7, -3)}

Tags

CCSS.8.F.A.1

Label the following set of ordered pairs as either a function or a non-function.

{(1, 3), (2, 4), (3, 5)}

Tags

CCSS.8.F.A.1

Given the relation A = {(5, 3), (4, 6), (7, 9), (x, 9)}. Which value for x will make the relation A a function?

• 5

• 4

• 9

• 7

Tags

CCSS.8.F.A.1

Given the relation B = {(4, 3), (5, 8), (9, 7), (x, 5)}. Which of the following values for x will make the relation B NOT a function?

• 3

• 5

• 6

• 10

Tags

CCSS.8.F.A.1

Determine if the following ordered pairs represent a function.

• {(1,3), (1,4), (2, 4), (3, 6), (4,5), (5,7)}

• {(3,1), (4,1), (4,2), (6,3), (5,4), (7,5)}

• {(100,50), (200,100), (300,150)}

• {(50,100), (75,125), (100, 150), (50, 125)}

Tags

CCSS.8.F.A.1

Review these Input/Output Values and determine whether or not they represent a function.

Input (x) 8, -9, 2, -2, 1, 0

Output (y) -4, 1, -2, 1, 0, 0

• Yes, because each input occurs only once.

• Yes, because each output occurs only one.

• No, because an x-value repeats.

• No, because an y-value repeats.

Tags

CCSS.8.F.A.1