Is the following relation a function?

two ovals, one labeled x and the other labeled y. the negative 2 in the x oval is pointing to the 5 in the y oval, the 0 in x is pointing to 1 and 3 in y, 5 in x pointing to 8 in y, and 7 in x pointing to 5 in y

yes

no

The answer is No.
Because the 0 in x oval is pointing to BOTH 1 and 3 in y oval.
And that must not happen in order to relation be a function.
The following conditions must be satisfied for relation to be a function:
1. condition: EVERY element in first oval has to be connected to some element in second oval.
2. condition: Elements in first oval MUST NOT have more than one connection with elements in second oval.