Is this a function or Not and why

What is the difference in the 2 relations that make B a function but A not a function? fa In relation B, each x value has one and only one y value while in relation A, the x values 2 and 4 have more than one corresponding y value. Ex. 1 Based on our deductions above, are the following relations also functions? a) G: (x, y) = (number of golfers, score below dr above par) = {(0, 2), (0, 1), (0,0) (0,5)} ? Not a function x = O has 4 corresponding y values b) c) Children at ABC Daycare "2 4 6 8 Number of children 7 Not a function x = 1 ~\" Function each x has 1 y. err $ 2 y values