The ordered pairs (1, 81), (2, 100), (3, 121), (4, 144), and (5, 169) represent a function. What is a rule that represents this function?
y = x^8
y = 8^x
y = (x + 8)^2
y = 8x ...?
y = x^8
y = 8^x
y = (x + 8)^2
y = 8x ...?