Functions Review

Which relation describes a function? What makes it a function?

• {(-2,3),(-2,5),(-6,7)} Each member of the range is unique.

• {(2,3),(3,3),(3,4)} Each member of the domain and range is positive.

• {(2,3),(3,3),(3,4)} Each member of the domain and range is a real number.

• {(-2,3),(-3,3),(-4,3)} Each member of the domain is assigned exactly one member of the range.

Which graph represents a function?

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Which table does NOT represent a function?

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Determine whether the relation shown here is a function. Explain your answer.

• function, an input has 1 output

• function, an input has 2 different outputs

• function, no output has 2 different inputs

• not a function, an input has 2 different outputs

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

Which set of numbers represents the range for the given coordinate?

{(-7,0), (8,-4), (-8,-8), (5,1), (-8,9)}

• {-7, 8, -8, 5}

• {-8, -4, 0,1,9}

• {0, -4, 8, -8, 1, 9}

• {-7, 0, -8, 8, 5}

Choose all the graphs that do not represent a function.

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Which sets of ordered pairs are functions?

Choose all that apply.

• (9, -1), (8, -2), (7, -3), (6, -4)

• (5, -1), (5, -2,), (5,12), (5, 0)

• (4, 2), (-4, 2), (2, 4), (-2, -4)

• (1, -4), (2, -4,), (3, -4), (4, -4)

• (5, 8), (4, 9), (5, 9), (4, 8)

Are the following inverses of each other? Use function composition.

• True

• False

Was the inverse function found correctly?

• no

• yes