Question

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 3 in the y oval, the 0 in x is pointing to 1 in y, 5 in x pointing to 8 in y, and 7 in x pointing to 5 in y

Answer 1

Just took the exam and the answer is no! :)

Answer 2

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 the first oval has to be connected to some element in the second oval.
2. condition: Elements in the first oval MUST NOT have more than one connection with elements in the second oval.