Brainiest answer! 50 points for 2!

In functions, there is never more than 1 y value for any x value.
We must immediately eliminate the 1st, 2nd and 4th answer choices.  Only the third graph does not show more than 1 y value for any given x value.

Explained below :)

(I tried my best, sorry if it doesn't make sense.)

Step-by-step explanation:

Example: 1/4 - 1/8= ?

1: Find the common denominator (bottom number)

2: If the common denominator is 8 then you multiply 1/4 by 2/2 to get the denominator of 8. If you needed then you can multiply the other fraction to get the same denominator.

3: Once you get multiply that then you get 2/8 -1/8.

4: Subtract the numerator (top number) 1

5: Keep the numerator (8)

6: Your answer would be 1/8