Introduction to Functions

What is the definition of function?

• Has inputs and outputs
• Every input has only ONE output
• Inputs have different outputs every time
• x-values and y-values

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All of the x values or inputs are called what?

• Domain
• Range
• Relation
• Function

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All of the y values or outputs are called what?

• Domain

• Range

• Relation

• Function

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Is this graph a function or not a function? (Use the vertical line test)

• Function

• Not a Function

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Is this graph a function or not a function? (Use the vertical line test)

• Function

• Not a Function

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Which table represents a function?

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Which relation is a function?

• {(2, 3) , (1, 5) , (2, 7)}

• {(-1, 5) , (-2, 6) , (-3, 7)}

• {(11, 9) , (11, 5) , (9, 3)}

• {(3, 8) , (0, 8) , (3, -2)}

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Which relation is a function?

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For the function {(0,1), (1,-3), (2,-4), (-4,1)}, write the domain.
Remember:  Domain is x 
(x,y)

• D: {1, -3, -4,}
  R: {0, 1, 2, -4}
• D:{0, 1, 2, -4}
  R:{1, -3, -4}
• D:{0, 1, 2, 3, 4}
  R:{1, -3, -4}

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What is the domain of a relation?

• the set of all x-values

• the set of all y-values

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