Question

Is the following relation a function?

Answer 1

If each x corresponds to exactly one y value, then it's a function

Answer 2

You can use the vertical line test to visually determine the answer.

Answer 3

What's the vertical line test?

Answer 4

you get a pencil and trace it across the entire thing, if no two points are 'touching' the pencil, then its a function

Answer 5

and you keep the pencil vertical throughout the whole test (pass it over the graph from left to right)

Answer 6

Okay, so that picture is a function?

Answer 7

yes

Answer 8

notice how there are no C curves its just one wavy line, no flip backs or straight up parts.

Answer 9

So if I do the pencil across the thing and two points touch the line I draw then it's a function?

Answer 10

if two points touch the vertical line, then it's NOT a function

Answer 11

no if it ouches its not if your doing it and thre is a backwards or forwards C shape then its a non function