Q. Look at this set of ordered pairs:(12,−9)(19,8)(12,15)Is this relation a function?Choices:(A) yes(B) no
Check x-values: Check x-values in the ordered pairs: (12,−9), (19,8), (12,15).x-values are 12, 19, 12.
See for repeats: See if any x-value repeats.The x-value 12 repeats.
Determine function status: Determine if the relation is a function.A function must have only one y-value for each x-value.Since the x-value 12 has two different y-values (–9 and 15), it's not a function.