Question

Which of the following expressions represents a function?

{(1, 2), (4, –2), (8, 3), (9, –3)}

y2 = 16 − x2

2x2 + y2 = 5

x = 7

Answer 1

{(1, 2), (4, –2), (8, 3), (9, –3)} and x = 7 represents a function.