Question

is x=y^2 a function?

Answer 1

No, it will give a sideways parabola and will fail the "vertical line test"

Answer 2

wait how about x=-y^2

Answer 3

I'm pretty sure this is a function, and doesn't fail the "verticle line test"
http://www.wolframalpha.com/input/?i=x%3Dy^2+

Answer 4

same, it will be sideways but just open towards to left

Answer 5

Wolfram doesn't use implicit functions

Answer 6

rightttt, cuz if it was a y=x^2 then it would be a normal parabola and it would pass the vertical line test right?

Answer 7

google "Implicit function plotter" and you'll get something more sensical

Answer 8

Yes exactly :)

Answer 9

correctoooo thanks for your help mr. or ma'am.

Answer 10

http://www.flashandmath.com/mathlets/calc/implicit/implicit.html

Answer 11

You'll see the sideways parabola there :)