Verified answer

Because there is more than 1 value of y for a value of x.

As for the domain, x can never be negative. y^6 is always non-negative no matter what y is.

y=x^2 is a function because for a value of x, there is 1 and only 1 value of y.

GRAPH IT!

x=y^6 looks like a parabola, but it goes to the right instead of up.

It does not pass the vertical line test. a function is not allowed to have more than 1 y value per x value.

For example, if x=1 then y can be either 6 or -6

y=x^2 passes the vertical line test