Function or Not a Function?

Which of the following is a function?

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Answer explanation

Sue's note goes to one place.

The football game is mapped to more than one home.

Sue's example is a function.

Tags

CCSS.8.F.A.1

Choose all of the following relations that are NOT functions. (Select all that apply)

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Answer explanation

Using a mapping relation, if each input (x) goes to exactly one output (y), then that relation is a function.

Tags

CCSS.8.F.A.1

Which of the following tables are a function? (Check all that apply)

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Answer explanation

All 3 are functions. Each input/x value has exactly one output/y value.

Tags

CCSS.8.F.A.1

Which graph example does NOT represent a function?

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Which relation set is a function? Select all that apply.

•  $\left\{\left(2,\ 3\right),\ \left(3,\ 4\right)\ \left(\ 4,\ 5\right)\ ,\ \left(5,\ 5\right)\right\}$  

•  $\left\{\left(-1,\ -5\right),\ \left(2,\ 4\right)\ \left(\ 2,\ -1\right)\ ,\ \left(0,\ 2\right)\right\}$  

•  $\left\{\left(4,\ 4\right),\ \left(5,\ 5\right)\ \left(\ 8,\ 8\right)\ ,\ \left(10,\ 10\right)\right\}$  

•  $\left\{\left(4,\ 3\right),\ \left(5,\ -3\right)\ \left(\ 5,\ 1\right)\ ,\ \left(6,\ 5\right)\right\}$  

Answer explanation

The set that begins with (2, 3) and the set that begins with (4,4) are both functions. Each input/x goes exactly to one output/y.

Tags

CCSS.8.F.A.1