Final answer:
The function rule that represents the given ordered pairs is y = x².
Step-by-step explanation:
The given ordered pairs (1, 1), (2, 4), (3, 9), (4, 16), and (5, 25) represent a function.
To find a rule that represents this function, we can look for a pattern in the relationship between the x-values and the corresponding y-values.
By observing the given pairs, we can see that the y-values are the squares of the x-values.
Therefore, the rule that represents this function is y = x².