Identifying Functions Using Tables and Mapping Diagrams and Sets

• Function

• Not a Function

Tags

CCSS.8.F.A.1

The following is not a function because...

• There are two values that equal 2.

• x = 10 and x = 40 has two values each.

• In the f(x) column, the 5 repeats.

• This table is actually a function.

Tags

CCSS.8.F.A.1

Which set of ordered pairs is a function?

• {(9,5), (10,5), (9,-5), (10,-5)}

• {(3,4), (4,-3), (7,4), (3, 8)}

• {(6,-5), (7, -3), (8, -1), (9, 1)}

• {(2, -2), (5, 9), (5, -7), (1, 4)}

Tags

CCSS.8.F.A.1

Does this mapping diagram represent a function?

• No, because an input value goes to multiple output values
• Yes, because each input goes to one and only one output

Tags

CCSS.8.F.A.1

• Yes
• No

Tags

CCSS.8.F.A.1

Is this graph a function or not a function? 

• Function
• Not a Function

• Function
• Not a Function

Tags

CCSS.8.F.A.1

How do you use the vertical line test?

• Draw vertical lines through your graph. If any of the vertical lines you draw intersects the graph more than once then the graph is not the graph of a function.

• Draw vertical lines through your graph. If any of the vertical lines you draw intersects the graph more than once, then it is a function.

Is this mapping a function or not a function?

• Function; the x's don't repeat

• Not a Function; the x's repeat

Tags

CCSS.8.F.A.1

Is this graph a function or not a function? 

• Function
• Not a Function