Question

X = {(2, 4), (3, 4), (4,4), (5, 4)) Is x a function and why?

Answer 1

x is a function

since it forms a horizontal line it passes the vertical line test and is a function

Answer 2

Because they all have a different x number. Even though the y numbers are the same you can tell wether a set of numbers are a function by the x numbers. So since there are different x numbers it is a function. I hope this helps!