Function or Not a Function, That is the Question.

Front

Is this a function?

Back

Yes

Front

Is this a function?

Back

No

Answer explanation

The input of 1 has two different outputs. This is not a function.

Front

Is this a function?

Back

No

Answer explanation

The input of -2 corresponds with two different outputs. This is not a function.

Front

Is this a function?

Back

Yes

Front

Is this a function?

Back

Yes

Answer explanation

The input for 3 has 4 different outputs.

Front

Is this a function?

Back

No

Answer explanation

The inputs of -2 and 0 have 2 different outputs.

Front

Is this a function?

Back

No

Answer explanation

The input of 2 has 2 different outputs.

Front

Is this a function?

Back

No

Answer explanation

The input of 1 has 2 different outputs.

Front

Is this a function?

Back

No

Answer explanation

When a vertical line goes through two different points on the line, it is not a function.

Front

Is this a function?

Back

Yes