Question

Help with 2 part question, who's with me =)

Answer 1

You know about the vertical line test. If you see a graph of a relation, using the vertical line test you can easily tell whether the relation is a function or not.
Now you need to find out if a relation is a function based on a table of x and y values.

Answer 2

It is also very simple.
If each x-coordinate value appears only once, it is a function.
If you see the same x-coordinate used more than once, it is not a function.
The same x-coordinate used more than once would generate points along the same vertical line, so the relation would fail the vertical line test and would not be a function.

Answer 3

What are the x-coordinates in Part 1?

Answer 4

-2
0
2
4

Answer 5

Great.
Are the x-coordinates all different numbers, or do you see the same number more than once?

Answer 6

different

Answer 7

Then what do you conclude, function or not function?

Answer 8

Reminder of what was written above:
"If each x-coordinate value appears only once, it is a function.
If you see the same x-coordinate used more than once, it is not a function."

Answer 9

FUnction

Answer 10

Correct.
Now can you do part 2 on your own?

Answer 11

For Part 2, do you get function or not function?

Answer 12

It is not a function

Answer 13

Correct.
Great job!