Determine whether the relation represents y as a function

Question

Determine whether the relation represents y as a function x=y²

Answer 1

Nope, doesn't pass the vertical line test

there's more than one OP for a given IP

it's not a function

x=y^2 so

y = + or -x, that's 2 y's for a given x value

graphically, it's a horizontal parabola