Graph. Help x < 9
To draw a ray, plot an endpoint and select an arrow. Select an endpoint to change it from
closed to open. Select the middle of the ray to delete it.
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Work it out

Relation 1: function // Relation 2: not a function

Step-by-step explanation:

A function means that the x value can only be used once.

For example, in relation 1, you can clearly see that each domain only has one range:

(rock, 7)

(desk, 4)

(sky, 4)

(paper, 4)

(door, 4)

However, in relation 2, we can see that the domain 4 has two ranges, therefore making it NOT a function.

(7, 0)

(4, -2)

(4, 5)

(-6, 0)

(0, 5)

You can see that the domain 4 has been used twice which makes it not a function.

Hope this helps! I hope I'm not too late with my answer and I apologize if I got this incorrect.