The set of ordered pairs that defines a function is: Β {(1,3),(5,2),(6,9),(1,12),(10,2)} (last option).What is a Function?A set of ordered pairs that defines a function will have exactly one y-value that assigned to every x-value. In essence, it means none of its x-values can have two corresponding y-value.All the sets of ordered pairs have exactly one y-value that corresponds to each of its x-value except {(1,3),(5,2),(6,9),(1,12),(10,2)}, which have two different y-values that corresponds to the x-value of 1.Therefore, the set that doesn't define a function is: Β {(1,3),(5,2),(6,9),(1,12),(10,2)} (last option).Learn more about function on: